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Document and Entity Information Document - shares	9 Months Ended	12 Months Ended
Document and Entity Information Document - shares	Sep. 30, 2013	Dec. 31, 2013	Oct. 28, 2013
Entity Information [Line Items]
Entity Registrant Name	FEDERAL REALTY INVESTMENT TRUST
Entity Central Index Key	0000034903
Current Fiscal Year End Date		--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus		2013
Document Fiscal Period Focus	Q3
Amendment Flag	false
Trading Symbol	FRT
Entity Common Stock, Shares Outstanding			66,040,956
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Operating (including $265,019 and $264,506 of consolidated variable interest entities, respectively)	$ 4,574,676	$ 4,473,813
Construction-in-progress	452,406	288,714
Assets held for sale (discontinued operations)	0	17,147
Real Estate Investment Property, At Cost, Total	5,027,082	4,779,674
Less accumulated depreciation and amortization (including $17.327 and $12,024 of consolidated variable interest entities, respectively)	(1,316,358)	(1,224,295)
Net real estate	3,710,724	3,555,379
Cash and cash equivalents	127,831	36,988
Accounts and notes receivable, net	87,284	73,861
Mortgage notes receivable, net	55,198	55,648
Investment in real estate partnership	32,971	33,169
Prepaid expenses and other assets	132,831	132,659
Debt issuance costs, net of accumulated amortization of $11,258 and $10,140, respectively	12,637	10,861
TOTAL ASSETS	4,159,476	3,898,565
Liabilities
Mortgages payable (including $203,423 and $205,299 of consolidated variable interest entities, respectively)	721,185	760,789
Capital lease obligations	71,677	71,693
Notes payable	299,828	299,575
Senior notes and debentures	1,213,508	1,076,545
Accounts payable and accrued expenses	160,634	120,929
Dividends payable	51,846	47,685
Security deposits payable	12,596	12,957
Other liabilities and deferred credits	103,272	103,379
Total liabilities	2,634,546	2,493,552
Commitments and contingencies (Note 7)
Redeemable noncontrolling interests	93,820	94,420
Shareholders' equity
Preferred shares, authorized 15,000,000 shares, $.01 par: 5.417% Series 1 Cumulative Convertible Preferred Shares, (stated at liquidation preference $25 per share), 399,896 shares issued and outstanding	9,997	9,997
Common shares of beneficial interest, $.01 par, 100,000,000 shares authorized, 66,036,174 and 64,815,446 shares issued and outstanding, respectively	660	648
Additional paid-in capital	2,000,965	1,875,525
Accumulated dividends in excess of net income	(600,091)	(586,970)
Accumulated other comprehensive loss	(3,539)	(12,388)
Total shareholders' equity of the Trust	1,407,992	1,286,812
Noncontrolling interests	23,118	23,781
Total shareholders' equity	1,431,110	1,310,593
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 4,159,476	$ 3,898,565

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Operating Real Estate From Consolidated Variable Interest Entities	$ 265,019	$ 265,019	$ 264,506
Accumulated depreciation and amortization, consolidated variable interest entities	17,327	17,327	12,024
Accumulated Amortization, Deferred Finance Costs	11,258	11,258	10,140
Mortgage Payable From Consolidated Variable Interest Entities	$ 203,423	$ 203,423	$ 205,299
Preferred Stock, Shares Authorized	15,000,000	15,000,000	15,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01
Preferred Stock, Liquidation Preference Per Share	$ 25	$ 25	$ 25
Preferred Stock, Shares Issued	399,896	399,896	399,896
Preferred Stock, Shares Outstanding	399,896	399,896	399,896
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000	100,000,000
Common Stock, Shares, Issued	66,036,174	66,036,174	64,815,446
Common Stock, Shares, Outstanding	66,036,174	66,036,174	64,815,446
5.417% Series 1 Cumulative Convertible Preferred [Member]
Preferred Stock, Dividend Rate, Percentage	5.417%	5.417%	5.417%

Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
REVENUE
Rental income	$ 154,308	$ 146,943	$ 460,136	$ 428,330
Other property income	3,480	9,007	9,661	17,842
Mortgage interest income	1,242	1,282	3,770	3,834
Total revenue	159,030	157,232	473,567	450,006
EXPENSES
Rental expenses	29,045	29,658	86,755	82,609
Real estate taxes	18,400	17,224	53,604	49,680
General and administrative	7,543	8,751	22,902	22,894
Depreciation and amortization	39,341	34,847	119,615	106,451
Total operating expenses	94,329	90,480	282,876	261,634
OPERATING INCOME	64,701	66,752	190,691	188,372
Other interest income	70	261	165	580
Interest expense	(25,762)	(28,218)	(80,314)	(85,744)
Early extinguishment of debt	0	0	(3,399)	0
Income from real estate partnerships	381	490	1,065	1,229
INCOME FROM CONTINUING OPERATIONS	39,390	39,285	108,208	104,437
DISCONTINUED OPERATIONS
Discontinued Operations - income	100	400	900	1,100
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	23,861	0	23,861	0
Results from discontinued operations	23,976	371	24,803	1,077
INCOME BEFORE GAIN ON SALE OF REAL ESTATE	63,366	39,656	133,011	105,514
Gain on sale of real estate	0	0	4,994	11,860
NET INCOME	63,366	39,656	138,005	117,374
Net income attributable to noncontrolling interests	(1,268)	(1,012)	(3,780)	(3,141)
NET INCOME ATTRIBUTABLE TO THE TRUST	62,098	38,644	134,225	114,233
Dividends on preferred shares	(136)	(136)	(406)	(406)
NET INCOME AVAILABLE FOR COMMON SHAREHOLDERS	$ 61,962	$ 38,508	$ 133,819	$ 113,827
EARNINGS PER COMMON SHARE, BASIC
Continuing operations	$ 0.57	$ 0.59	$ 1.58	$ 1.57
Discontinued Operations	0.37	0.01	0.38	0.02
Gain on sale of real estate	0.00	0.00	0.08	0.19
Earnings Per Share, Basic, Total	$ 0.94	$ 0.60	$ 2.04	$ 1.78
Weighted average common shares outstanding-basic	65,504	64,014	65,118	63,711
EARNINGS PER COMMON SHARE, DILUTED
Continuing operations	$ 0.57	$ 0.59	$ 1.58	$ 1.56
Discontinued Operations	0.37	0.01	0.38	0.02
Gain on sale of real estate	0.00	0.00	0.08	0.19
Earnings Per Share, Diluted, Total	$ 0.94	$ 0.60	$ 2.04	$ 1.77
Weighted average number of common shares-diluted	65,647	64,202	65,271	63,891
Comprehensive Income	$ 62,195	$ 36,804	$ 146,854	$ 108,087
Comprehensive Income Attributable to the Trust	$ 60,927	$ 35,792	$ 143,074	$ 104,946

Consolidated Statement Of Shareholders' Equity - 9 months ended Sep. 30, 2013 - USD ($) $ in Thousands	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Dividends in Excess of Net Income [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Beginning balance (in shares) at Dec. 31, 2012		399,896	64,815,446
Beginning balance at Dec. 31, 2012	$ 1,310,593	$ 9,997	$ 648	$ 1,875,525	$ (586,970)	$ (12,388)	$ 23,781
Net income, excluding $2,117 attributable to redeemable noncontrolling interests	135,888				134,225		1,663
Other Comprehensive Income - change in value of interest rate swaps	8,849					8,849
Dividends declared to common shareholders	(146,940)				(146,940)
Dividends declared to preferred shareholders	(406)				(406)
Distributions declared to noncontrolling interests	(1,529)						(1,529)
Common shares issued (in shares)			1,075,123
Common shares issued	116,797		$ 11	116,786
Exercise of stock options (in shares)			16,304
Exercise of stock options	1,005		$ 0	1,005
Shares issued under dividend reinvestment plan (in shares)			15,002
Shares issued under dividend reinvestment plan	1,610			1,610
Share-based compensation expense, net of shares withheld for employee taxes (in shares)			91,823
Share-based compensation expense, net of shares withheld for employee taxes	6,665		$ 1	6,664
Conversion and redemption of OP units (in shares)			22,476
Conversion and redemption of OP units	(1,422)			(625)			(797)
Ending balance (in shares) at Sep. 30, 2013		399,896.000	66,036,174.000
Ending balance at Sep. 30, 2013	$ 1,431,110	$ 9,997	$ 660	$ 2,000,965	$ (600,091)	$ (3,539)	$ 23,118

Consolidated Statement Of Shareholders' Equity (Parentheticals) $ in Thousands	9 Months Ended
	Sep. 30, 2013 USD ($)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interests	$ 2,117

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
Net income	$ 138,005	$ 117,374
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization, including discontinued operations	119,885	106,702
Gain on sale of real estate	(28,855)	(11,860)
Income from real estate partnerships	(1,065)	(1,229)
Other, net	2,578	4,236
Changes in assets and liabilities, net of effects of acquisitions and dispositions
Increase in accounts receivable	(10,182)	(2,419)
Increase in prepaid expenses and other assets	(949)	(7,393)
Increase in accounts payable and accrued expenses	4,906	5,217
Increase (decrease) in security deposits and other liabilities	2,405	(1,473)
Net cash provided by operating activities	226,728	209,155
INVESTING ACTIVITIES
Acquisition of real estate	(47,202)	(8,927)
Capital expenditures - development and redevelopment	(156,651)	(92,316)
Capital expenditures - other	(32,200)	(33,700)
Proceeds from sale of real estate	42,866	0
Distribution from real estate partnership in excess of earnings	93	420
Leasing costs	(9,088)	(9,003)
Repayment of mortgage and other notes receivable, net	695	91
Net cash used in investing activities	(201,487)	(143,435)
FINANCING ACTIVITIES
Costs to upsize and extend revolving credit facility	(1,929)	0
Issuance of Senior Notes, net of costs	269,347	244,807
Redemption and retirement of senior notes	(135,000)	(175,000)
Issuance of mortgages, capital leases and notes payable, net of costs	0	5,399
Repayment of mortgages, capital leases and notes payable	(37,375)	(16,312)
Issuance of common shares	118,087	93,668
Dividends paid to common and preferred shareholders	(141,849)	(131,172)
Distributions to and redemptions of noncontrolling interests	(5,679)	(7,236)
Net cash provided by financing activities	65,602	14,154
Increase in cash and cash equivalents	90,843	79,874
Cash and cash equivalents at beginning of year	36,988	67,806
Cash and cash equivalents at end of period	$ 127,831	$ 147,680

Business And Organization	9 Months Ended
Business And Organization	Sep. 30, 2013
Nature Of Operations [Abstract]
BUSINESS AND ORGANIZATION	BUSINESS AND ORGANIZATION Federal Realty Investment Trust (the “Trust”) is an equity real estate investment trust (“REIT”) specializing in the ownership, management, and redevelopment of retail and mixed-use properties. Our properties are located primarily in densely populated and affluent communities in strategically selected metropolitan markets in the Mid-Atlantic and Northeast regions of the United States, and California. As of September 30, 2013, we owned or had a controlling interest in community and neighborhood shopping centers and mixed-use properties which are operated as 87 predominantly retail real estate projects. We operate in a manner intended to enable us to qualify as a REIT for federal income tax purposes. A REIT that distributes at least 90% of its taxable income to its shareholders each year and meets certain other conditions is not taxed on that portion of its taxable income which is distributed to its shareholders. Therefore, federal income taxes on our taxable income have been and are generally expected to be immaterial. We are obligated to pay state taxes, generally consisting of franchise or gross receipts taxes in certain states. Such state taxes also have not been material.

Summary Of Significant Accounting Policies

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation

Our consolidated financial statements include the accounts of the Trust, its corporate subsidiaries, and all entities in which the Trust has a controlling interest or has been determined to be the primary beneficiary of a variable interest entity (“VIE”). The equity interests of other investors are reflected as noncontrolling interests or redeemable noncontrolling interests. All significant intercompany transactions and balances are eliminated in consolidation. We account for our interests in joint ventures, which we do not control, using the equity method of accounting. Certain 2012 amounts have been reclassified to conform to current period presentation.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, referred to as “GAAP,” requires management to make estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and revenues and expenses. These estimates are prepared using management’s best judgment, after considering past, current and expected events and economic conditions. Actual results could differ from these estimates.

Recently Adopted Accounting Pronouncements

In February 2013, the FASB issued ASU 2013-02, “Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income.” ASU 2013-02 requires entities to disclose certain information relating to amounts reclassified out of accumulated other comprehensive income. We adopted the standard effective January 1, 2013 and it did not have a significant impact to our consolidated financial statements.

Consolidated Statements of Cash Flows—Supplemental Disclosures

The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows:



	Nine Months Ended September 30,
	2013			2012
	(In thousands)
SUPPLEMENTAL DISCLOSURES:
Total interest costs incurred	$	91,208		$	93,213
Interest capitalized	(10,894		)	(7,469		)
Interest expense	$	80,314		$	85,744
Cash paid for interest, net of amounts capitalized	$	85,240		$	89,959
Cash paid (refunded) for income taxes	$	408		$	(1,144	)
NON-CASH FINANCING TRANSACTION:
Shares issued under dividend reinvestment plan	$	(1,325	)	$	(1,395	)

Real Estate	9 Months Ended
Real Estate	Sep. 30, 2013
Real Estate [Abstract]
Real Estate Acquisitions Dispositions Discontinued Operations Text Block	REAL ESTATE On April 3, 2013, we acquired the fee interest in a 95,000 square foot retail property located in Darien, Connecticut for $47.3 million. The purchase price allocation will be finalized after our valuation studies are complete. We incurred approximately $0.2 million of acquisition costs which are included in "general and administrative expenses" for the nine months ended September 30, 2013. On April 5, 2013, one of our tenants acquired our fee interest in the land under an office building at our Village of Shirlington property in Arlington, Virginia, that was subject to a long term ground lease. The ground lease included an option for the tenant to purchase the fee interest. The sales price was $6.5 million, and the gain was $5.0 million. On July 22, 2013, we sold the fee interest in our final building at Fifth Avenue in San Diego, California, for a sales price of $15.3 million resulting in a gain of $10.7 million. On September 10, 2013 we sold the fee interest in a building in Forest Hills (Queens), New York, for a sales price of $20.4 million resulting in a gain of $13.2 million. Both sales were completed as a Section 1031 tax deferred exchange transaction with the acquisition of the property in Darien.

Real Estate Partnerships

9 Months Ended

Sep. 30, 2013

Equity Method Investments and Joint Ventures [Abstract]

REAL ESTATE PARTNERSHIPS

REAL ESTATE PARTNERSHIP

We have a joint venture arrangement (the “Partnership”) with affiliates of a discretionary fund created and advised by ING Clarion Partners (“Clarion”). We own 30% of the equity in the Partnership and Clarion owns 70%. We hold a general partnership interest, however, Clarion also holds a general partnership interest and has substantive participating rights. We cannot make significant decisions without Clarion’s approval. Accordingly, we account for our interest in the Partnership using the equity method. As of September 30, 2013, the Partnership owned seven retail real estate properties. We are the manager of the Partnership and its properties, earning fees for acquisitions, dispositions, management, leasing, and financing. Intercompany profit generated from fees is eliminated in consolidation. We also have the opportunity to receive performance-based earnings through our Partnership interest. Accounting policies for the Partnership are similar to accounting policies followed by the Trust. The Partnership is subject to a buy-sell provision which is customary for real estate joint venture agreements and the industry. Either partner may initiate this provision at any time, which could result in either the sale of our interest or the use of available cash or borrowings to acquire Clarion’s interest.

The following tables provide summarized operating results and the financial position of the Partnership:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
	(In thousands)
OPERATING RESULTS
Revenue	$	4,642	$	4,772	$	14,215	$	14,070
Expenses
Other operating expenses	1,321		1,242		4,456		3,809
Depreciation and amortization	1,369		1,372		4,099		4,123
Interest expense	840		844		2,523		2,533
Total expenses	3,530		3,458		11,078		10,465
Net income	$	1,112	$	1,314	$	3,137	$	3,605
Our share of net income from real estate partnership	$	381	$	490	$	1,065	$	1,286



	September 30,		December 31,
	2013		2012
	(In thousands)
BALANCE SHEETS
Real estate, net	$	171,896	$	174,509
Cash	3,452		2,735
Other assets	5,782		5,536
Total assets	$	181,130	$	182,780
Mortgages payable	$	56,982	$	57,155
Other liabilities	3,809		4,771
Partners’ capital	120,339		120,854
Total liabilities and partners’ capital	$	181,130	$	182,780
Our share of unconsolidated debt	$	17,095	$	17,147
Our investment in real estate partnership	$	32,971	$	33,169

- Definition

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

+ References + Details

Debt

9 Months Ended

Sep. 30, 2013

Debt Instruments [Abstract]

DEBT

During the nine months ended September 30, 2013, we repaid the following mortgage loans at par:



	Payoff Amount		Repayment Date	Maturity Date
	(In millions)
White Marsh Plaza	$	9.0	January 2, 2013	April 1, 2013
Crow Canyon	$	19.3	June 11, 2013	August 11, 2013

On April 22, 2013, we upsized our $400.0 million revolving credit facility to $600.0 million and extended the maturity date to April 21, 2017, subject to a one-year extension at our option. Under the amended credit facility, the spread over LIBOR is 90 basis points based on our credit rating as of May 1, 2013.

On May 9, 2013, we issued $275.0 million of fixed rate senior notes that mature on June 1, 2023 and bear interest at 2.75%. The net proceeds from this note offering after issuance discounts, underwriting fees and other costs were approximately $269.3 million.

On June 9, 2013, we redeemed our $135.0 million 5.40% senior notes prior to the original maturity date of December 1, 2013. The redemption price of $138.5 million included a make-whole premium of approximately $3.3 million and accrued but unpaid interest of $0.2 million. The make-whole premium is included in "early extinguishment of debt" for the nine months ended September 30, 2013.

There was no balance outstanding on our revolving credit facility as of and for the three months ended September 30, 2013. During the nine months ended September 30, 2013, the maximum amount of borrowings outstanding under our revolving credit facility was $76.0 million, the weighted average amount of borrowings outstanding was $13.0 million, and the weighted average interest rate, before amortization of debt fees, was 1.29%.

Our revolving credit facility, term loan and certain notes require us to comply with various financial covenants, including the maintenance of minimum shareholders’ equity and debt coverage ratios and a maximum ratio of debt to net worth. As of September 30, 2013, we were in compliance with all loan covenants.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Fair Value Of Financial Instruments

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

Except as disclosed below, the carrying amount of our financial instruments approximates their fair value. The fair value of our mortgages payable, notes payable and senior notes and debentures is sensitive to fluctuations in interest rates. Quoted market prices (Level 1) were used to estimate the fair value of our marketable senior notes and debentures and discounted cash flow analysis (Level 2) is generally used to estimate the fair value of our mortgages and notes payable. Considerable judgment is necessary to estimate the fair value of financial instruments. The estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized upon disposition of the financial instruments. A summary of the carrying amount and fair value of our mortgages payable, notes payable and senior notes and debentures is as follows:



	September 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
Mortgages and notes payable	$	1,021,013	$	1,055,657	$	1,060,364	$	1,110,757
Senior notes and debentures	$	1,213,508	$	1,247,124	$	1,076,545	$	1,190,833

As of September 30, 2013, we have two interest rate swap agreements with a notional amount of $275.0 million that are measured at fair value on a recurring basis. The interest rate swap agreements fix the variable portion of our $275.0 million term loan at 1.72% from December 1, 2011 through November 1, 2018. We assess effectiveness of our cash flow hedges both at inception and on an ongoing basis. The effective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recorded in accumulated other comprehensive income/loss and is subsequently reclassified into interest expense as interest is incurred on the related variable rate debt. Within the next 12 months, we expect to reclassify an estimated $4.5 million as an increase to interest expense. Our cash flow hedges become ineffective if critical terms of the hedging instrument and the debt instrument do not perfectly match such as notional amounts, settlement dates, reset dates, calculation period and LIBOR rate. In addition, we evaluate the default risk of the counterparty by monitoring the credit-worthiness of the counterparty. When ineffectiveness exists, the ineffective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recognized in earnings in the period affected. Hedge ineffectiveness has not impacted earnings as of September 30, 2013, and we do not anticipate it will have a significant effect in the future.

The fair values of the interest rate swap agreements are based on the estimated amounts we would receive or pay to terminate the contracts at the reporting date and are determined using interest rate pricing models and interest rate related observable inputs. The fair value of our swaps at September 30, 2013 was a liability of $3.5 million and is included in "accounts payable and accrued expenses" on our consolidated balance sheets. For the three and nine months ended September 30, 2013, the change in valuation on our interest rate swaps was a decrease of $1.2 million and an increase of $8.8 million, respectively, (including $1.1 million and $3.2 million, respectively, reclassified from other comprehensive loss to interest expense) and is included in "accumulated other comprehensive loss."

A summary of our financial liabilities that are measured at fair value on a recurring basis, by level within the fair value hierarchy is as follows:



	September 30, 2013								December 31, 2012
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	(In thousands)
Interest rate swaps	$	—	$	3,539	$	—	$	3,539	$	—	$	12,388	$	—	$	12,388

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES We are sometimes involved in lawsuits, warranty claims, and environmental matters arising in the ordinary course of business. Management makes assumptions and estimates concerning the likelihood and amount of any potential loss relating to these matters. We are currently a party to various legal proceedings. We accrue a liability for litigation if an unfavorable outcome is probable and the amount of loss can be reasonably estimated. If an unfavorable outcome is probable and a reasonable estimate of the loss is a range, we accrue the best estimate within the range; however, if no amount within the range is a better estimate than any other amount, the minimum within the range is accrued. Legal fees related to litigation are expensed as incurred. We do not believe that the ultimate outcome of these matters, either individually or in the aggregate, could have a material adverse effect on our financial position or overall trends in results of operations; however, litigation is subject to inherent uncertainties. Also under our leases, tenants are typically obligated to indemnify us from and against all liabilities, costs and expenses imposed upon or asserted against us (1) as owner of the properties due to certain matters relating to the operation of the properties by the tenant, and (2) where appropriate, due to certain matters relating to the ownership of the properties prior to their acquisition by us. Under the terms of certain partnership agreements, the partners have the right to exchange their operating partnership units for cash or the same number of our common shares, at our option. A total of 285,722 operating partnership units are outstanding which have a total fair value of $29.0 million, based on our closing stock price on September 30, 2013.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-SubTopic 20
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Shareholders' Equity

9 Months Ended

Sep. 30, 2013

Stockholders' Equity Note [Abstract]

SHAREHOLDERS’ EQUITY

The following table provides a summary of dividends declared and paid per share:



	Nine Months Ended September 30,
	2013				2012
	Declared		Paid		Declared		Paid
Common shares	$	2.240	$	2.190	$	2.110	$	2.070
5.417% Series 1 Cumulative Convertible Preferred shares	$	1.016	$	1.016	$	1.016	$	1.016

We have an at the market (“ATM”) equity program in which we may from time to time offer and sell common shares having an aggregate offering price of up to $300.0 million. We intend to use the net proceeds to fund potential acquisition opportunities, fund our development and redevelopment pipeline, repay amounts outstanding under our revolving credit facility and/or for general corporate purposes. For the three months ended September 30, 2013, we issued 340,457 common shares at a weighted average price per share of $103.36 for net cash proceeds of $34.8 million and paid $0.4 million in commissions and less than $0.1 million in additional offering expenses related to the sales of these common shares. For the nine months ended September 30, 2013, we issued 1,075,036 common shares at a weighted average price per share of $110.00 for net cash proceeds of $116.8 million and paid $1.3 million in commissions and $0.1 million in additional offering expenses related to the sales of these common shares. As of September 30, 2013, we had the capacity to issue up to $95.1 million in common shares under our ATM equity program.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Section S99
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-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Components Of Rental Income

9 Months Ended

Sep. 30, 2013

Components Of Rental Income and Expense [Abstract]

COMPONENTS OF RENTAL INCOME AND EXPENSE

COMPONENTS OF RENTAL INCOME

The principal components of rental income are as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
	(In thousands)
Minimum rents
Retail and commercial	$	111,928	$	105,858	$	334,628	$	312,519
Residential	7,196		7,116		21,525		20,467
Cost reimbursement	30,364		29,085		89,850		82,376
Percentage rent	1,912		1,667		6,036		5,167
Other	2,908		3,217		8,097		7,801
Total rental income	$	154,308	$	146,943	$	460,136	$	428,330

Minimum rents include the following:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
	(In millions)
Straight-line rents	$	1.1		$	1.8		$	3.7		$	3.8
Amortization of above market leases	$	(0.5	)	$	(0.8	)	$	(2.0	)	$	(2.6	)
Amortization of below market leases	$	1.3		$	1.1		$	4.3		$	3.4

Discontinued Operations

9 Months Ended

Sep. 30, 2013

Discontinued Operations and Disposal Groups [Abstract]

DISCONTINUED OPERATIONS

Results of properties disposed or held for disposal which meet certain requirements, constitute discontinued operations and as such, the operations of these properties are classified as discontinued operations for all periods presented. A summary of the financial information for the discontinued operations is as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
	(in millions)
Revenue from discontinued operations	$	0.4	$	0.6	$	1.5	$	1.6
Income from discontinued operations	0.1		0.4		0.9		1.1

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1020-107759

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43-48
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Share-Based Compensation Plans

9 Months Ended

Sep. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

SHARE-BASED COMPENSATION PLANS

A summary of share-based compensation expense included in net income is as follows:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
	(In thousands)
Share-based compensation incurred
Grants of common shares	$	2,671		$	2,754		$	8,284		$	7,644
Grants of options	69			77			223			358
	2,740			2,831			8,507			8,002
Capitalized share-based compensation	(405		)	(230		)	(793		)	(683		)
Share-based compensation expense	$	2,335		$	2,601		$	7,714		$	7,319

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings Per Share

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

EARNINGS PER SHARE

We have calculated earnings per share (“EPS”) under the two-class method. The two-class method is an earnings allocation methodology whereby EPS for each class of common stock and participating securities is calculated according to dividends declared and participation rights in undistributed earnings. For the three and nine months ended September 30, 2013 and 2012, we had 0.3 million weighted average unvested shares outstanding, which are considered participating securities. Therefore, we have allocated our earnings for basic and diluted EPS between common shares and unvested shares; the portion of earnings allocated to the unvested shares is reflected as “earnings allocated to unvested shares” in the reconciliation below.

In the dilutive EPS calculation, dilutive stock options were calculated using the treasury stock method consistent with prior periods. There were no anti-dilutive stock options for the three and nine months ended September 30, 2013 and 2012. The conversions of downREIT operating partnership units and 5.417% Series 1 Cumulative Convertible Preferred Shares are anti-dilutive for all periods presented and accordingly, have been excluded from the weighted average common shares used to compute diluted EPS.



	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
	(In thousands, except per share data)
NUMERATOR
Income from continuing operations	$	39,390		$	39,285		$	108,208		$	104,437
Less: Preferred share dividends	(136		)	(136		)	(406		)	(406		)
Less: Income from continuing operations attributable to noncontrolling interests	(1,268		)	(1,012		)	(3,780		)	(3,141		)
Less: Earnings allocated to unvested shares	(278		)	(221		)	(659		)	(638		)
Income from continuing operations available for common shareholders	37,708			37,916			103,363			100,252
Results from discontinued operations attributable to the Trust	23,976			371			24,803			1,077
Gain on sale of real estate	—			—			4,994			11,860
Net income available for common shareholders, basic and diluted	$	61,684		$	38,287		$	133,160		$	113,189
DENOMINATOR
Weighted average common shares outstanding—basic	65,504			64,014			65,118			63,711
Effect of dilutive securities:
Stock options	143			188			153			180
Weighted average common shares outstanding—diluted	65,647			64,202			65,271			63,891
EARNINGS PER COMMON SHARE, BASIC
Continuing operations	$	0.57		$	0.59		$	1.58		$	1.57
Discontinued operations	0.37			0.01			0.38			0.02
Gain on sale of real estate	—			—			0.08			0.19
	$	0.94		$	0.60		$	2.04		$	1.78
EARNINGS PER COMMON SHARE, DILUTED
Continuing operations	$	0.57		$	0.59		$	1.58		$	1.56
Discontinued operations	0.37			0.01			0.38			0.02
Gain on sale of real estate	—			—			0.08			0.19
	$	0.94		$	0.60		$	2.04		$	1.77
Income from continuing operations attributable to the Trust	$	38,122		$	38,273		$	104,428		$	101,296

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2013
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENT On October 1, 2013, we acquired an 11.8 acre parcel of land adjacent to our Assembly Row development project for a purchase price of $18.0 million.

Summary Of Significant Accounting Policies (Policy)	9 Months Ended
Summary Of Significant Accounting Policies (Policy)	Sep. 30, 2013
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation Our consolidated financial statements include the accounts of the Trust, its corporate subsidiaries, and all entities in which the Trust has a controlling interest or has been determined to be the primary beneficiary of a variable interest entity (“VIE”). The equity interests of other investors are reflected as noncontrolling interests or redeemable noncontrolling interests. All significant intercompany transactions and balances are eliminated in consolidation. We account for our interests in joint ventures, which we do not control, using the equity method of accounting. Certain 2012 amounts have been reclassified to conform to current period presentation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, referred to as “GAAP,” requires management to make estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and revenues and expenses. These estimates are prepared using management’s best judgment, after considering past, current and expected events and economic conditions. Actual results could differ from these estimates.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 40
-Section 45
-URI http://asc.fasb.org/section&trid=2197723

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196966

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-URI http://asc.fasb.org/subtopic&trid=2197087

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.3A-02)
-URI http://asc.fasb.org/extlink&oid=6959686&loc=d3e355033-122828

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33801-111570

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=18733093&loc=d3e5614-111684

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 46R
-Paragraph 4
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 5, 6, 16-19
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 96-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 46R
-Paragraph 4
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 20
-Subparagraph a(2)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 97-2
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph k
-Article 1

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02, 03
-Article 3A

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 46R
-Paragraph 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Summary Of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Schedule Of Supplemental Disclosures Related To Consolidated Statements Of Cash Flows

The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows:



	Nine Months Ended September 30,
	2013			2012
	(In thousands)
SUPPLEMENTAL DISCLOSURES:
Total interest costs incurred	$	91,208		$	93,213
Interest capitalized	(10,894		)	(7,469		)
Interest expense	$	80,314		$	85,744
Cash paid for interest, net of amounts capitalized	$	85,240		$	89,959
Cash paid (refunded) for income taxes	$	408		$	(1,144	)
NON-CASH FINANCING TRANSACTION:
Shares issued under dividend reinvestment plan	$	(1,325	)	$	(1,395	)

Real Estate Partnerships (Tables)

9 Months Ended

Sep. 30, 2013

Equity Method Investments and Joint Ventures [Abstract]

Summarized Operating Results And Financial Position Of Partnership

The following tables provide summarized operating results and the financial position of the Partnership:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
	(In thousands)
OPERATING RESULTS
Revenue	$	4,642	$	4,772	$	14,215	$	14,070
Expenses
Other operating expenses	1,321		1,242		4,456		3,809
Depreciation and amortization	1,369		1,372		4,099		4,123
Interest expense	840		844		2,523		2,533
Total expenses	3,530		3,458		11,078		10,465
Net income	$	1,112	$	1,314	$	3,137	$	3,605
Our share of net income from real estate partnership	$	381	$	490	$	1,065	$	1,286



	September 30,		December 31,
	2013		2012
	(In thousands)
BALANCE SHEETS
Real estate, net	$	171,896	$	174,509
Cash	3,452		2,735
Other assets	5,782		5,536
Total assets	$	181,130	$	182,780
Mortgages payable	$	56,982	$	57,155
Other liabilities	3,809		4,771
Partners’ capital	120,339		120,854
Total liabilities and partners’ capital	$	181,130	$	182,780
Our share of unconsolidated debt	$	17,095	$	17,147
Our investment in real estate partnership	$	32,971	$	33,169

Debt (Tables)

9 Months Ended

Sep. 30, 2013

Debt Instruments [Abstract]

Schedule of Debt Repayments [Table Text Block]



	Payoff Amount		Repayment Date	Maturity Date
	(In millions)
White Marsh Plaza	$	9.0	January 2, 2013	April 1, 2013
Crow Canyon	$	19.3	June 11, 2013	August 11, 2013

Fair Value Of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Summary Of Carrying Amount And Fair Value Of Financial Instruments

A summary of the carrying amount and fair value of our mortgages payable, notes payable and senior notes and debentures is as follows:



	September 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
Mortgages and notes payable	$	1,021,013	$	1,055,657	$	1,060,364	$	1,110,757
Senior notes and debentures	$	1,213,508	$	1,247,124	$	1,076,545	$	1,190,833

Fair Value, Liabilities Measured on Recurring Basis

A summary of our financial liabilities that are measured at fair value on a recurring basis, by level within the fair value hierarchy is as follows:



	September 30, 2013								December 31, 2012
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	(In thousands)
Interest rate swaps	$	—	$	3,539	$	—	$	3,539	$	—	$	12,388	$	—	$	12,388

- Definition

Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References + Details

Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2013

Stockholders' Equity Note [Abstract]

Schedule of Dividends Declared and Paid Per Share [Table Text Block]

The following table provides a summary of dividends declared and paid per share:



	Nine Months Ended September 30,
	2013				2012
	Declared		Paid		Declared		Paid
Common shares	$	2.240	$	2.190	$	2.110	$	2.070
5.417% Series 1 Cumulative Convertible Preferred shares	$	1.016	$	1.016	$	1.016	$	1.016

Components Of Rental Income (Tables)

9 Months Ended

Sep. 30, 2013

Components Of Rental Income and Expense [Abstract]

Schedule Of Principal Components Of Rental Income

The principal components of rental income are as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
	(In thousands)
Minimum rents
Retail and commercial	$	111,928	$	105,858	$	334,628	$	312,519
Residential	7,196		7,116		21,525		20,467
Cost reimbursement	30,364		29,085		89,850		82,376
Percentage rent	1,912		1,667		6,036		5,167
Other	2,908		3,217		8,097		7,801
Total rental income	$	154,308	$	146,943	$	460,136	$	428,330

Schedule of Minimum Rents Components

Minimum rents include the following:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
	(In millions)
Straight-line rents	$	1.1		$	1.8		$	3.7		$	3.8
Amortization of above market leases	$	(0.5	)	$	(0.8	)	$	(2.0	)	$	(2.6	)
Amortization of below market leases	$	1.3		$	1.1		$	4.3		$	3.4

Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2013

Discontinued Operations and Disposal Groups [Abstract]

Schedule Of Discontinued Operations Financial Information

A summary of the financial information for the discontinued operations is as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
	(in millions)
Revenue from discontinued operations	$	0.4	$	0.6	$	1.5	$	1.6
Income from discontinued operations	0.1		0.4		0.9		1.1

Share-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

A summary of share-based compensation expense included in net income is as follows:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
	(In thousands)
Share-based compensation incurred
Grants of common shares	$	2,671		$	2,754		$	8,284		$	7,644
Grants of options	69			77			223			358
	2,740			2,831			8,507			8,002
Capitalized share-based compensation	(405		)	(230		)	(793		)	(683		)
Share-based compensation expense	$	2,335		$	2,601		$	7,714		$	7,319

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share



	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
	(In thousands, except per share data)
NUMERATOR
Income from continuing operations	$	39,390		$	39,285		$	108,208		$	104,437
Less: Preferred share dividends	(136		)	(136		)	(406		)	(406		)
Less: Income from continuing operations attributable to noncontrolling interests	(1,268		)	(1,012		)	(3,780		)	(3,141		)
Less: Earnings allocated to unvested shares	(278		)	(221		)	(659		)	(638		)
Income from continuing operations available for common shareholders	37,708			37,916			103,363			100,252
Results from discontinued operations attributable to the Trust	23,976			371			24,803			1,077
Gain on sale of real estate	—			—			4,994			11,860
Net income available for common shareholders, basic and diluted	$	61,684		$	38,287		$	133,160		$	113,189
DENOMINATOR
Weighted average common shares outstanding—basic	65,504			64,014			65,118			63,711
Effect of dilutive securities:
Stock options	143			188			153			180
Weighted average common shares outstanding—diluted	65,647			64,202			65,271			63,891
EARNINGS PER COMMON SHARE, BASIC
Continuing operations	$	0.57		$	0.59		$	1.58		$	1.57
Discontinued operations	0.37			0.01			0.38			0.02
Gain on sale of real estate	—			—			0.08			0.19
	$	0.94		$	0.60		$	2.04		$	1.78
EARNINGS PER COMMON SHARE, DILUTED
Continuing operations	$	0.57		$	0.59		$	1.58		$	1.56
Discontinued operations	0.37			0.01			0.38			0.02
Gain on sale of real estate	—			—			0.08			0.19
	$	0.94		$	0.60		$	2.04		$	1.77
Income from continuing operations attributable to the Trust	$	38,122		$	38,273		$	104,428		$	101,296

Business And Organization (Details)	9 Months Ended
Business And Organization (Details)	Sep. 30, 2013
Nature Of Operations [Abstract]
Number of Real Estate Properties	87
Minimum Percentage Of Taxable Income Distributed To Shareholders	90.00%

Summary Of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Total interest costs incurred			$ 91,208	$ 93,213
Interest capitalized			(10,894)	(7,469)
Interest expense	$ 25,762	$ 28,218	80,314	85,744
Cash paid for interest, net of amounts capitalized			85,240	89,959
Cash paid for income taxes			408	(1,144)
Dividends contributed to dividend reinvestment plan			$ (1,325)	$ (1,395)

Real Estate (Details) $ in Thousands				3 Months Ended		9 Months Ended
Real Estate (Details) $ in Thousands	Sep. 10, 2013 USD ($)	Jul. 22, 2013 USD ($)	Apr. 05, 2013 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Apr. 03, 2013 USD ($) ft²
Significant Acquisitions and Disposals [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax				$ 23,861	$ 0	$ 23,861	$ 0
Gain on sale of real estate				$ 0	$ 0	4,994	$ 11,860
Darien [Member]
Significant Acquisitions and Disposals [Line Items]
Area of Real Estate Property \| ft²								95,000
Business Acquisition Purchase Price								$ 47,300
Business Combination, Acquisition Related Costs						$ 200
Shirlington [Member]
Significant Acquisitions and Disposals [Line Items]
Sales of Real Estate			$ 6,500
Gain on sale of real estate			$ 5,000
Fifth Avenue [Member]
Significant Acquisitions and Disposals [Line Items]
Sales of Real Estate		$ 15,300
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		$ 10,700
Forest Hills [Member]
Significant Acquisitions and Disposals [Line Items]
Sales of Real Estate	$ 20,400
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$ 13,200

Real Estate Partnerships (Narrative) (Details)	Sep. 30, 2013 properties
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	87
Federal / Lion Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	7
Federal Realty Investment Trust [Member] \| Federal / Lion Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in partnership	30.00%
Clarion [Member] \| Federal / Lion Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in partnership	70.00%

Real Estate Partnerships (Summarized Operating Results and Financial Position of Partnership) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Real Estate Partnerships Operating Results [Line Items]
Revenue	$ 159,030	$ 157,232	$ 473,567	$ 450,006
Depreciation and amortization	39,341	34,847	119,615	106,451
Interest expense	25,762	28,218	80,314	85,744
NET INCOME	63,366	39,656	138,005	117,374
Our share of net income from real estate partnership	381	490	1,065	1,229
Real estate, net	3,710,724		3,710,724		$ 3,555,379
Cash	127,831	147,680	127,831	147,680	36,988	$ 67,806
TOTAL ASSETS	4,159,476		4,159,476		3,898,565
Mortgages payable	721,185		721,185		760,789
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,159,476		4,159,476		3,898,565
Our investment in real estate partnership	32,971		32,971		33,169
Federal / Lion Venture LP [Member]
Real Estate Partnerships Operating Results [Line Items]
Revenue	4,642	4,772	14,215	14,070
Other operating expenses	1,321	1,242	4,456	3,809
Depreciation and amortization	1,369	1,372	4,099	4,123
Interest expense	840	844	2,523	2,533
Total expenses	3,530	3,458	11,078	10,465
NET INCOME	1,112	1,314	3,137	3,605
Our share of net income from real estate partnership	381	$ 490	1,065	$ 1,286
Real estate, net	171,896		171,896		174,509
Cash	3,452		3,452		2,735
Other assets	5,782		5,782		5,536
TOTAL ASSETS	181,130		181,130		182,780
Mortgages payable	56,982		56,982		57,155
Other liabilities	3,809		3,809		4,771
Partners' capital	120,339		120,339		120,854
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	181,130		181,130		182,780
Our share of unconsolidated debt	17,095		17,095		17,147
Our investment in real estate partnership	$ 32,971		$ 32,971		$ 33,169

Debt (Details) $ in Thousands						9 Months Ended
Debt (Details) $ in Thousands	Jun. 11, 2013 USD ($)	Jun. 09, 2013 USD ($)	May 09, 2013 USD ($)	May 01, 2013	Jan. 02, 2013 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Apr. 21, 2013 USD ($)	Dec. 31, 2012 USD ($)
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period						$ 76,000
Senior notes and debentures						1,213,508			$ 1,076,545
Line of Credit Facility, Maximum Borrowing Capacity						600,000		$ 400,000
Basis Points Spread				90
Line of Credit Facility, Average Outstanding Amount						$ 13,000
LineofCreditFacilityWeightedAverageInterestRateBeforeAmortizationOfDebt Fees						1.29%
Line of Credit Facility, Amount Outstanding						$ 0
Issuance of Senior Notes, net of costs						$ 269,347	$ 244,807
White Marsh Plaza [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt					$ 9,000
Crow Canyon [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt	$ 19,300
Issuance of Debt [Member] \| Senior275PercentNotes [Member] [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			$ 275,000
Debt Instrument, Interest Rate, Stated Percentage			2.75%
Issuance of Senior Notes, net of costs			$ 269,300
Repayment of Debt [Member] \| Senior 5.40 Percent Notes [Member]
Debt Instrument [Line Items]
Senior notes and debentures		$ 135,000
Debt Instrument, Interest Rate, Stated Percentage		5.40%
Early Repayment of Senior Debt		$ 138,500
Prepayment Premium On Senior Note		3,300
Interest Paid		$ 200

Fair Value Of Financial Instruments (Summary Of Carrying Amount And Fair Value Of Financial Instruments) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2013 USD ($) agreement	Sep. 30, 2013 USD ($) agreement	Dec. 31, 2012 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes and debentures, carrying value	$ 1,213,508	$ 1,213,508	$ 1,076,545
Notional Amount of Interest Rate Cash Flow Hedge Derivatives	$ 275,000	$ 275,000
Derivative, Fixed Interest Rate	1.72%	1.72%
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 4,500	$ 4,500
Other Comprehensive Income (Loss)	(1,200)	8,849
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Interest Expense	1,100	3,200
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgages and notes payable, carrying value	1,021,013	1,021,013	1,060,364
Senior notes and debentures, carrying value	1,213,508	1,213,508	1,076,545
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgages and notes payable, fair value	1,055,657	1,055,657	1,110,757
Senior notes and debentures, fair value	$ 1,247,124	$ 1,247,124	1,190,833
Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of Interest Rate Derivatives Held \| agreement	2	2
Interest Rate Swap [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	$ 3,539	$ 3,539	$ 12,388
Accumulated Other Comprehensive Income (Loss) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Comprehensive Income (Loss)		$ 8,849

Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2013 USD ($) shares
Loss Contingencies [Line Items]
Operating partnership units, outstanding \| shares	285,722
Operating partnership units outstanding, fair value \| $	$ 29.0

- Definition

The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

+ References + Details

Shareholders Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	May 08, 2012
Net cash proceeds of common stock		$ 118,087	$ 93,668
Remaining Capacity To Issue	$ 95,100	$ 95,100
At The Market Equity Program [Member]
Aggregate offering price of common share				$ 300,000
Shares issued under equity program	340,457	1,075,036
Weighted average price per common share	$ 103.36	$ 110.00
Net cash proceeds of common stock	$ 34,800	$ 116,800
Common Shares [Member]
Shares issued under equity program		1,075,123
Commissions [Member] \| At The Market Equity Program [Member]
Payments of stock issuance costs	400	$ 1,300
Other Offering Costs [Member] \| At The Market Equity Program [Member]
Payments of stock issuance costs		$ 100
less than [Member] \| Other Offering Costs [Member] \| At The Market Equity Program [Member]
Payments of stock issuance costs	$ 100

Shareholders' Equity Shareholders' Equity Summary of Dividends (Details) - $ / shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Common Shares [Member]
Dividends [Line Items]
Common Stock, Dividends, Per Share, Declared			$ 2.240	$ 2.110
Common Stock, Dividends, Per Share, Cash Paid			$ 2.190	$ 2.070
5.417% Series 1 Cumulative Convertible Preferred [Member]
Dividends [Line Items]
Preferred Stock, Dividend Rate, Percentage	5.417%	5.417%	5.417%	5.417%	5.417%
Preferred Stock, Dividends Per Share, Declared			$ 1.016	$ 1.016
Preferred Stock, Dividends, Per Share, Cash Paid			$ 1.016	$ 1.016

Components Of Rental Income (Schedule Of Principal Components Of Rental Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Cost reimbursement	$ 30,364	$ 29,085	$ 89,850	$ 82,376
Percentage rent	1,912	1,667	6,036	5,167
Other	2,908	3,217	8,097	7,801
Total rental income	154,308	146,943	460,136	428,330
Commercial Real Estate [Member]
Minimum rents	111,928	105,858	334,628	312,519
Residential Real Estate [Member]
Minimum rents	$ 7,196	$ 7,116	$ 21,525	$ 20,467

Components Of Rental Income (Schedule Of Minimum Rent) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Minimum Rent [Line Items]
Straight-line rents	$ 1.1	$ 1.8	$ 3.7	$ 3.8
Above Market Leases [Member]
Minimum Rent [Line Items]
Amortization of Acquired Intangible Assets	(0.5)	(0.8)	(2.0)	(2.6)
Below Market Leases [Member]
Minimum Rent [Line Items]
Amortization Of Acquired Below Market Leases	$ 1.3	$ 1.1	$ 4.3	$ 3.4

Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Discontinued Operations and Disposal Groups [Abstract]
Revenue from discontinued operations	$ 0.4	$ 0.6	$ 1.5	$ 1.6
Discontinued Operations - income	$ 0.1	$ 0.4	$ 0.9	$ 1.1

Share-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Share-Based Compensation (Details) - USD ($) $ in Thousands	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	$ 2,740	$ 2,831	$ 8,507	$ 8,002
Capitalized share-based compensation	(405)	(230)	(793)	(683)
Share-based compensation expense	2,335	2,601	7,714	7,319
Restricted Stock [Member]
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	2,671	2,754	8,284	7,644
Stock Options [Member]
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	$ 69	$ 77	$ 223	$ 358

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Earnings Per Share (Narrative) (Details) - $ / shares shares in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Earnings Per Share Narrative [Line Items]
Discontinued Operations	$ 0.37	$ 0.01	$ 0.38	$ 0.02
Weighted average unvested shares outstanding	0.3	0.3	0.3	0.3
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.0	0.0	0.0	0.0
5.417% Series 1 Cumulative Convertible Preferred [Member]
Earnings Per Share Narrative [Line Items]
Preferred Stock, Dividend Rate, Percentage	5.417%	5.417%	5.417%	5.417%	5.417%

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8, 9, 10, 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 61A
-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780137-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Participating Security
-URI http://asc.fasb.org/extlink&oid=6519812

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
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-SubTopic 10
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-Paragraph 68B
-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5498026-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-6
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number EITF03-6-1
-Paragraph 6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 61
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 60
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income from continuing operations	$ 39,390	$ 39,285	$ 108,208	$ 104,437
Less: Preferred share dividends	(136)	(136)	(406)	(406)
Less: Income from continuing operations attributable to noncontrolling interests	(1,268)	(1,012)	(3,780)	(3,141)
Less: Earnings allocated to unvested shares	(278)	(221)	(659)	(638)
Income from continuing operations available for common shareholders	37,708	37,916	103,363	100,252
Results from discontinued operations attributable to the Trust	23,976	371	24,803	1,077
Gain on sale of real estate	0	0	4,994	11,860
Net income available for common shareholders, basic and diluted	$ 61,684	$ 38,287	$ 133,160	$ 113,189
Weighted average common shares outstanding-basic	65,504	64,014	65,118	63,711
Stock options	143	188	153	180
Weighted average common shares outstanding-diluted	65,647	64,202	65,271	63,891
Continuing operations	$ 0.57	$ 0.59	$ 1.58	$ 1.57
Discontinued Operations	0.37	0.01	0.38	0.02
Gain on Sale of Real Estate per Basic Share	0.00	0.00	0.08	0.19
Earnings Per Share, Basic, Total	0.94	0.60	2.04	1.78
Continuing operations	0.57	0.59	1.58	1.56
Discontinued Operations	0.37	0.01	0.38	0.02
Gain on sale of real estate	0.00	0.00	0.08	0.19
Earnings Per Share, Diluted, Total	$ 0.94	$ 0.60	$ 2.04	$ 1.77
Income from continuing operations attributable to the Trust	$ 38,122	$ 38,273	$ 104,428	$ 101,296

Subsequent Events (Details) - LandParcelAdjacenttoAssemblyRow [Member] $ in Millions	Oct. 01, 2013 USD ($) a
Subsequent Event [Line Items]
Acres of Real Estate Property \| a	11.8
Land Acquisition Purchase Price \| $	$ 18.0