Entity Address, State or Province Entity Address, State or Province Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number Title of 12(b) Security Title of 12(b) Security Written Communications Written Communications Depository Shares Depository Shares [Member] Depository Shares [Member] Entity Emerging Growth Company Entity Emerging Growth Company Soliciting Material Soliciting Material City Area Code City Area Code Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, Address Line One Entity Information [Line Items] Entity Information [Line Items] Local Phone Number Local Phone Number Cover [Abstract] Cover [Abstract] Pre-commencement Tender Offer Pre-commencement Tender Offer Amendment Flag Amendment Flag Common Shares Of Beneficial Interest Common Shares Of Beneficial Interest [Member] Common Shares Of Beneficial Interest [Member] Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Trading Symbol Trading Symbol Document Period End Date Document Period End Date Class of Stock [Domain] Class of Stock [Domain] Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] Entity Registrant Name Entity Registrant Name Entity Address, City or Town Entity Address, City or Town Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entities [Table] Entities [Table] Entity Central Index Key Entity Central Index Key Security Exchange Name Security Exchange Name