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$ 291,734

26,383

107,163

281,235

367,789

2,157,276

^[1]

3,231,580

Mortgages Payable

Principal balance

491,561

$ 466,305

16,228

25,820

65,539

30,541

117,018

236,415

491,561

Senior Notes and Debentures

2018

275,506

2019

^[2]

563

2020

41,624

2021

^[3]

694

2022

771

Thereafter

1,661

Long-term debt

320,819

Revolving credit facility

Principal balance

2,419,200

1,994,200

250,000

250,000

1,919,200

2,419,200

Line of credit facility, annual facility fee

1,000

Revolving credit facility | Notes Payable

Revolving credit facility

41,000

Term Loan | Notes Payable

Income from continuing operations

Other Notes Payable

$ 275,000

[1]	The total debt maturities differ from the total reported on the consolidated balance sheet as of December 31, 2017 due to the unamortized premium/(discount) and debt issuance costs on mortgage loans, notes payable, and senior notes.
[2]	Our $275.0 million unsecured term loan matures on November 21, 2018, subject to a one-year extension at our option.
[3]	Our $800.0 million revolving credit facility matures on April 20, 2020, subject to two six-month extensions at our option. As of December 31, 2017, there was $41.0 million outstanding under this credit facility.

Debt (Future Minimum Lease Payments) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Debt Disclosure [Abstract]
2018	$ 5,800
2019	5,800
2020	5,800
2021	5,800
2022	5,810
Thereafter	142,425
Future minimum lease payments	171,435
Less amount representing interest	(99,879)
Present value	$ 71,556

Fair Value Of Financial Instruments (Summary Of Carrying Amount And Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Mortgages payable and notes payable \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value of long-term debt	$ 811,770	$ 750,268
Mortgages payable and notes payable \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value of long-term debt	824,419	760,260
Senior notes and debentures \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value of long-term debt	2,401,440	1,976,594
Senior notes and debentures \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value of long-term debt	$ 2,498,445	$ 2,015,973

Fair Value Of Financial Instruments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) agreement	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Other comprehensive income (loss) - change in value of interest rate swaps	$ 2,599	$ 1,533	$ (595)
Interest expense reclassified from other comprehensive loss	1,800	3,500
Interest Rate Swap \| Term loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Term loan	$ 275,000
Interest rate of variable portion of term loan	1.72%
Fair Value, Measurements, Recurring \| Prepaid expenses and other assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value of interest rate swaps (less than for 2017)	$ 100
Fair Value, Measurements, Recurring \| Accounts payable and accrued expenses
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair value of interest rate swaps (less than for 2017)		2,600
Fair Value, Measurements, Recurring \| Interest Rate Swap
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Number of interest rate swap agreements \| agreement	2
Notional amount of interest rate swap agreements	$ 275,000
Fair value of interest rate swaps (less than for 2017)	22	(2,577)
Accumulated other comprehensive income (loss)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Other comprehensive income (loss) - change in value of interest rate swaps	$ 2,599	$ 1,533	$ (595)

Fair Value Of Financial Instruments (Summary of Financial Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Interest Rate Swap - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of interest rate swaps	$ 22	$ (2,577)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of interest rate swaps	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of interest rate swaps	22	(2,577)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of interest rate swaps	$ 0	$ 0

Commitments and Contingencies (Details) $ in Millions	3 Months Ended	12 Months Ended
Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Sep. 30, 2025 USD ($)	Oct. 16, 2023 USD ($)	Sep. 30, 2023 USD ($)	Oct. 16, 2021 USD ($)	Jan. 01, 2017
Loss Contingencies [Line Items]
Settlement amount		$ 0.4
Number of defendants		500
Reserves for warranties and general liability		$ 3.3	$ 2.8
Payments from reserves		1.4	2.0
Letters of credit outstanding, amount		$ 1.3
DownREIT operating partnership units, outstanding \| shares		787,962
Operating partnership units outstanding, fair value		$ 104.6
Congressional Plaza \| Put Option
Loss Contingencies [Line Items]
Maximum partnership percentage required to purchase		100.00%
Indexed ownership interest percentage		26.63%
Congressional Plaza \| Put Option \| Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option		$ 81.0
Congressional Plaza \| Put Option \| Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option		85.0
Montrose Crossing \| Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option		12.0
Montrose Crossing \| Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option		$ 13.0
Montrose Crossing \| Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage		10.10%
Plaza El Segundo \| Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option		$ 26.0
Plaza El Segundo \| Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option		$ 29.0
Plaza El Segundo \| Put Option
Loss Contingencies [Line Items]
Number of members with purchase options		2
The Grove at Shrewsbury \| Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage								4.80%
Brook 35 \| Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage								8.80%
Grove at Shrewsbury and Brook 35 \| Minimum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option		$ 9.0
Grove at Shrewsbury and Brook 35 \| Maximum
Loss Contingencies [Line Items]
Estimated maximum liability upon exercise of the put option		10.0
Scenario, Forecast \| Mercer Mall
Loss Contingencies [Line Items]
Purchase price under option						$ 55.0
Scenario, Forecast \| Mercer Mall \| Put Option
Loss Contingencies [Line Items]
Purchase price under option				$ 60.0
Scenario, Forecast \| Melville Mall
Loss Contingencies [Line Items]
Purchase price under option					$ 5.0		$ 5.0
Capital improvement, development, and redevelopment projects
Loss Contingencies [Line Items]
Contractual obligations		$ 326.6
Member One In Plaza El Segundo \| Plaza El Segundo \| Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage		10.00%
Member Two In Plaza El Segundo \| Plaza El Segundo \| Put Option
Loss Contingencies [Line Items]
Indexed ownership interest percentage		11.80%
Santana Row \| gain on sale of real estate
Loss Contingencies [Line Items]
Reversal of warranty reserve	$ 4.9		$ 4.9
Pending Litigation
Loss Contingencies [Line Items]
Additional liability		$ 0.2

Commitments and Contingencies (Schedule of Lease Payments) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	$ 4,583
2019	4,737
2020	4,749
2021	4,757
2022	4,873
Thereafter	188,132
Total	$ 211,831

Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Sep. 29, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Nov. 04, 2016
Class of Stock [Line Items]
Shares issued under dividend reinvestment plan (in shares)		17,911	15,619	16,524
Issuance of preferred shares, net of costs		$ 144,991	$ 0	$ 0
Preferred shares, par value		$ 0.01	$ 0.01
Conversion price per share		$ 104.69
Net cash proceeds of common stock		$ 118,583	$ 329,103	$ 110,855
At The Market Equity Program
Class of Stock [Line Items]
Shares issued		826,517	1,156,571
Net cash proceeds of common stock		$ 108,300	$ 174,800
Aggregate offering price of common shares					$ 400,000
Weighted average price per common share		$ 132.56	$ 152.92
Remaining capacity to issue		$ 261,300
At The Market Equity Program \| Commissions
Class of Stock [Line Items]
Commissions related to sales of common shares		1,100	$ 1,800
At The Market Equity Program \| Other Offering Costs
Class of Stock [Line Items]
Commissions related to sales of common shares		$ 200	$ 200
5.0% Series C Cumulative Redeemable Preferred Shares
Class of Stock [Line Items]
Preferred shares, shares outstanding		6,000	0
Preferred shares, percentage	5.00%	5.00%	5.00%	5.00%
Preferred shares, liquidation preference per share	$ 25,000	$ 25,000
Issuance of preferred shares, net of costs	$ 145,000
Preferred shares, par value	$ 0.01
5.417% Series 1 Cumulative Convertible Preferred Shares
Class of Stock [Line Items]
Preferred shares, shares outstanding		399,896	399,896	399,896
Preferred shares, percentage		5.417%	5.417%	5.417%
Preferred shares, liquidation preference per share		$ 25	$ 25	$ 25
Preferred shares, par value				$ 0.01
Depository Shares \| 5.0% Series C Cumulative Redeemable Preferred Shares
Class of Stock [Line Items]
Preferred shares, liquidation preference per share	$ 25.00
Preferred Shares
Class of Stock [Line Items]
Shares issued		6,000
Preferred Shares \| Depository Shares \| 5.0% Series C Cumulative Redeemable Preferred Shares
Class of Stock [Line Items]
Shares issued	6,000,000

Dividends (Details) - $ / shares			12 Months Ended
Dividends (Details) - $ / shares	Sep. 29, 2017	Nov. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Common shares, declared		$ 1	$ 3.960	$ 3.840	$ 3.620
Common shares, paid			3.940	3.800	3.550
Preferred shares, paid			1.354	1.354	1.354
Common shares, ordinary dividend			3.940	3.800	3.515
Common shares, capital gain			0.000	0.000	0.035
5.417% Series 1 Cumulative Convertible Preferred shares, ordinary dividend			1.354	1.354	1.340
5.417% Series 1 Cumulative Convertible Preferred shares, capital gain			$ 0.000	$ 0.000	$ 0.014
Common Stock, Ordinary Dividends, Tax Rate			15.00%	15.00%	15.00%
Preferred Stock, Ordinary Dividends, Tax Rate			15.00%	15.00%	15.00%
5.417% Series 1 Cumulative Convertible Preferred Shares
Class of Stock [Line Items]
Preferred shares, percentage			5.417%	5.417%	5.417%
Preferred shares, declared			$ 1.354	$ 1.354	$ 1.354
Preferred shares, paid			$ 1.354	$ 1.354	$ 1.354
5.0% Series C Cumulative Redeemable Preferred Shares
Class of Stock [Line Items]
Preferred shares, percentage	5.00%		5.00%	5.00%	5.00%
Preferred shares, declared			$ 0.368	$ 0.000	$ 0.000
Preferred shares, paid			$ 0.000	$ 0.000	$ 0.000

Operating Leases (Details) $ in Thousands	12 Months Ended
Operating Leases (Details) $ in Thousands	Dec. 31, 2017 USD ($) project lease state
Property Subject to or Available for Operating Lease [Line Items]
Number of real estate properties \| project	104
Number of states in which entity has properties \| state	12
Number of leases \| lease	3,000
Percent of annualized base rent	2.90%
Operating Leases, Future Minimum Payments Receivable [Abstract]
2018	$ 593,461
2019	537,822
2020	474,369
2021	401,869
2022	328,302
Thereafter	1,402,509
Total	$ 3,738,332
Retail and commercial \| Minimum
Property Subject to or Available for Operating Lease [Line Items]
Operating lease, term	3 years
Retail and commercial \| Maximum
Property Subject to or Available for Operating Lease [Line Items]
Operating lease, term	10 years
Residential \| Maximum
Property Subject to or Available for Operating Lease [Line Items]
Operating lease, term	1 year

Components of Rental Income and Expense (Schedule Of Principal Components Of Rental Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leases, Income Statement, Lease Revenue [Abstract]
Cost reimbursement	$ 171,528	$ 158,042	$ 148,110
Percentage rent	11,148	10,977	11,911
Other	18,191	18,547	15,169
Rental Income	841,461	786,583	727,812
Retail and commercial
Operating Leases, Income Statement, Lease Revenue [Abstract]
Minimum rents	585,178	549,552	509,825
Residential
Operating Leases, Income Statement, Lease Revenue [Abstract]
Minimum rents	$ 55,416	$ 49,465	$ 42,797

Components of Rental Income and Expense (Schedule Of Minimum Rent) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components Of Rental Income and Expense [Abstract]
Straight-line rents	$ 12,900	$ 8,100	$ 7,600
Net amortization of above and below market leases	$ 4,721	$ 1,825	$ 2,705

Components of Rental Income and Expense (Components Of Rental Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components Of Rental Income and Expense [Abstract]
Repairs and maintenance	$ 67,996	$ 64,942	$ 62,420
Utilities	25,763	24,968	23,003
Management fees and costs	22,297	20,823	18,639
Payroll	14,922	13,832	12,673
Marketing	9,007	8,520	9,046
Insurance	7,762	7,758	7,875
Ground rent	3,826	2,561	2,540
Bad debt expense	2,591	2,375	1,168
Other operating	10,726	12,547	10,229
Total rental expenses	$ 164,890	$ 158,326	$ 147,593

Share-Based Compensation Plans (Allocated Share-Based Compensation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	$ 12,371	$ 11,227	$ 12,074
Capitalized share-based compensation	(1,385)	(1,310)	(868)
Share-based compensation expense	$ 10,986	$ 9,917	$ 11,206

Share-Based Compensation Plans (Weighted Average Assumptions Used to Value Option Granted in 2016) (Details)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Volatility	18.80%
Expected dividend yield	2.80%
Expected term (in years)	6 years
Risk free interest rate	1.50%

Share-Based Compensation Plans (Schedule of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at the beginning of year (in shares)	259,119
Granted (in shares)	0	0
Exercised (in shares)	(152,634)
Forfeited or expired (in shares)	0
Outstanding at the end of year (in shares)	106,485
Exercisable at the end of year (in shares)	105,939
Outstanding at the beginning of year, Weighted-Average Exercise Price (in dollars per share)	$ 56.66
Granted, Weighted-Average Exercise Price (in dollars per share)	0.00
Exercised, Weighted-Average Exercise Price (in dollars per share)	65.37
Forfeited or Expired, Weighted-Average Exercise Price (in dollars per share)	0.00
Outstanding at the end of year, Weighted-Average Exercise Price (in dollars per share)	44.18
Exercisable at the end of the year, Weighted-Average Exercise Price (in dollars per share)	$ 43.62
Outstanding at the end of year, Weighted-Average Remaining Contractual Term (in years)	1 year 2 months
Exercisable at the end of year, Weighted-Average Remaining Contractual Term (in years)	1 year 1 month
Outstanding at the end of year, Aggregate Intrinsic Value	$ 9,451
Exercisable at the end of year, Aggregate Intrinsic Value	$ 9,451

Share-Based Compensation Plans (Restricted Share Activity) (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested at the beginning of year (in shares)	217,353
Granted (in shares)	109,815
Vested (in shares)	(87,704)
Forfeited (in shares)	(2,293)
Unvested at the end of year (in shares)	237,171	217,353
Unvested at the beginning of year, Weighted-Average Grant-Date Fair Value (in dollars per share)	$ 142.70
Granted, Weighted-Average Grant-Date Fair Value (in dollars per share)	139.31	$ 152.70	$ 141.08
Vested, Weighted-Average Grant-Date Fair Value (in dollars per share)	131.55
Forfeited, Weighted-Average Grant-Date Fair Value (in dollars per share)	142.09
Unvested at the end of year, Weighted-Average Grant-Date Fair Value (in dollars per share)		$ 142.70

Share-Based Compensation Plans (Common Shares Awarded Under Various Compensation Plans) (Details) - shares			12 Months Ended
	Feb. 07, 2018	Jan. 02, 2018	Dec. 31, 2017
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			109,815
Subsequent Event \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	92,552	5,416
Subsequent Event \| Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term	3 years
Subsequent Event \| Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term	4 years
Subsequent Event \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	488
Vesting Term	5 years

Share-Based Compensation Plans (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) plans $ / shares shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans \| plans	2
Number of options granted in period \| shares	0		0
Weighted average grant date fair value of options granted \| $ / shares	$ 19.52
Total cash received from options exercised	$ 10.0	$ 4.5	$ 2.0
Total intrinsic value of options exercised	10.7	$ 4.2	$ 2.1
Total unrecognized compensation cost related to unvested share-based compensation arrangements	$ 17.6
Period for recognition (in years)	6 years 5 months
Weighted-average period for recognition	2 years 2 months
Performance Incentive Plan 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares	2,450,000
Long Term Incentive Plan 2001
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares	3,250,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock awarded \| $ / shares	$ 139.31	$ 152.70	$ 141.08
Total vesting-date fair value of shares vested during the year	$ 12.5	$ 13.8	$ 26.1
Grants of common shares and options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term	3 years
Grants of common shares and options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term	7 years
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)	10 years

Savings and Retirement Plans (Details) - 401(K) and Deferred Compensation Plan - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
401(k) Maximum annual contribution per employee	$ 18,000	$ 18,000	$ 18,000
401(k) Employer match	50.00%	50.00%	50.00%
401(k) Employer contribution expense	$ 632,000	$ 602,000	$ 504,000
Deferred compensation liability to participants	$ 12,800,000	$ 10,500,000
Maximum
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
401(k) Maximum of employer match as a percentage of employee eligible earnings	5.00%	5.00%	5.00%

Earnings Per Share (Narrative) (Details) - shares	12 Months Ended
Earnings Per Share (Narrative) (Details) - shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share Narrative [Line Items]
Weighted average unvested shares outstanding	200,000	200,000	200,000
Anti-dilutive stock options excluded from dilutive earnings per share calculation	682	0	0
5.417% Series 1 Cumulative Convertible Preferred Shares
Earnings Per Share Narrative [Line Items]
Cumulative convertible preferred share, dividend rate	5.417%	5.417%	5.417%

Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2017

^[1]

Sep. 30, 2017

^[1]

Jun. 30, 2017

^[1]

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

^[2]

Jun. 30, 2016

Mar. 31, 2016

^[2]

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Earnings Per Share [Abstract]

$ 219,948

$ 226,425

$ 190,094

Less: Preferred share dividends

(2,458)

(541)

Less: Income from continuing operations attributable to noncontrolling interests

(7,666)

(7,648)

(8,205)

Less: Earnings allocated to unvested shares

(942)

(702)

(797)

Income from continuing operations available for common shareholders

208,882

217,534

180,551

Gain on sale of real estate and change in control of interests, net

(77,632)

(31,133)

(28,330)

Net income available for common shareholders, basic and diluted

$ 286,514

$ 248,667

$ 208,881

Weighted average common shares outstanding—basic

72,117

70,877

68,797

Stock options

116

172

184

Weighted average common shares outstanding—diluted

72,233

71,049

68,981

Earnings Per Common Share, Basic

$ 0.67

$ 1.47

$ 1.05

$ 0.78

$ 0.81

$ 0.82

$ 0.79

$ 1.10

$ 3.97

$ 3.51

$ 3.04

Earnings Per Common Share, Diluted

$ 0.67

$ 1.47

$ 1.05

$ 0.78

$ 0.80

$ 0.82

$ 0.78

$ 1.10

$ 3.97

$ 3.50

$ 3.03

Income from continuing operations attributable to the Trust

$ 212,282

$ 218,777

$ 181,889

[1]

[2]

First quarter 2016 includes a $25.7 million gain on change in control of interests from our Clarion Partners acquisition as further discussed in Note 3. Third quarter 2016 includes a $4.9 million gain on sale from the reversal of our warranty reserve on condominiums sold at Santana Row as further discussed in Note 7.

Selected Quarterly Financial Data (Unaudited) Summary Of Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Revenue

$ 223,957

$ 217,953

$ 208,049

$ 207,389

$ 204,109

$ 201,157

$ 197,981

$ 198,344

$ 857,348

$ 801,591

$ 744,012

Operating income

83,157

84,497

83,090

81,544

83,477

80,461

80,135

76,922

332,288

320,995

300,154

Net income

52,785

^[1]

108,882

^[1]

78,133

^[1]

58,070

59,724

61,198

^[2]

58,898

79,063

^[2]

297,870

258,883

218,424

NET INCOME ATTRIBUTABLE TO THE TRUST

50,656

^[1]

106,777

^[1]

76,291

^[1]

56,190

58,037

58,977

^[2]

55,941

76,955

^[2]

289,914

249,910

210,219

Net income available for common shareholders

$ 48,645

^[1]

$ 106,600

^[1]

$ 76,156

^[1]

$ 56,055

$ 57,902

$ 58,841

^[2]

$ 55,806

$ 76,820

^[2]

$ 287,456

$ 249,369

$ 209,678

Earnings Per Common Share, Basic

$ 0.67

^[1]

$ 1.47

^[1]

$ 1.05

^[1]

$ 0.78

$ 0.81

$ 0.82

^[2]

$ 0.79

$ 1.10

^[2]

$ 3.97

$ 3.51

$ 3.04

Net income available for common shareholders

$ 0.67

^[1]

$ 1.47

^[1]

$ 1.05

^[1]

$ 0.78

$ 0.80

$ 0.82

^[2]

$ 0.78

$ 1.10

^[2]

$ 3.97

$ 3.50

$ 3.03

[1]

[2]

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ in Thousands				3 Months Ended					12 Months Ended
	Dec. 28, 2017	May 12, 2016	Jan. 13, 2016	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Jun. 28, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Early extinguishment of debt				$ 12,300					$ (12,273)	$ 0	$ (19,072)
Coconut Grove \| CocoWalk
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of real estate, net of noncontrolling interests		$ 500
gain on sale of real estate \| Santana Row
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reversal of warranty reserve					$ 4,900					$ 4,900
Clarion
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on acquisition of controlling interest			$ 25,700					$ 25,700
Land \| Assembly Row
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Properties							$ 15,400
Gain on sale of real estate						$ 15,400
Land \| 150 Post Street And North Lake Commons
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of real estate					50,800
Land \| Bethesda Row
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Properties	$ 6,500
Condominiums \| Assembly Row
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of real estate				$ 1,500	$ 600	$ 3,300			$ 5,400

Schedule III Part II - Summary of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements [Abstract]
Balance at beginning of year	$ 6,759,073	$ 6,064,406	$ 5,608,998
Acquisitions	555,476	229,296	291,726
Improvements	492,541	483,932	281,471
Deduction during period—dispositions and retirements of property	172,029	18,561	117,789
Balance at end of year	7,635,061	6,759,073	6,064,406
Aggregate cost basis for Federal tax purposes	6,700,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,729,234	1,574,041	1,467,050
Additions during period—depreciation and amortization expense	193,340	173,244	156,513
Deductions during period—dispositions and retirements of property	46,030	18,051	49,522
Balance at end of year	$ 1,876,544	$ 1,729,234	$ 1,574,041

Schedule IV - Mortgage Loans on Real Estate (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Interest Rate

10.00%

9.90%

Prior Liens

$ 0

Carrying Amount of Mortgages

30,429

^[1]

30,429

Principal Amount of Loans Subject to delinquent Principal or Interest

Mortgage Loans on Real Estate, Other Required Disclosures [Abstract]

Aggregate tax basis for Federal tax purposes

30,400

$ 29,900

Movement in Mortgage Loans on Real Estate [Roll Forward]

Balance at beginning of year

29,904

41,618

$ 50,988

Issuance of loans

525

368

Collection and satisfaction of loans

(11,714)

(10,692)

Amortization of discount

954

Balance at end of year

30,429

$ 29,904

$ 41,618

Mortgage On Retail Buildings in Philadelphia, PA, Loan One

Prior Liens

Carrying Amount of Mortgages

21,179

^[2]

21,179

Principal Amount of Loans Subject to delinquent Principal or Interest

Mortgage On Retail Buildings in Philadelphia, PA, Loan One | Maximum

Mortgage On Retail Buildings in Philadelphia, PA, Loan Two

$ 25,000

Interest Rate

10.00%

Prior Liens

$ 0

Carrying Amount of Mortgages

9,250

9,250

Principal Amount of Loans Subject to delinquent Principal or Interest

$ 0

Interest Rate One | Mortgage On Retail Buildings in Philadelphia, PA, Loan One