Common Shares, $0.01 par value per share Common Stock [Member] Series E Cumulative Redeemable Preferred Shares, $0.01 par value Series E Preferred Stock [Member] Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line Two Entity Address, Address Line Two Entity File Number Entity File Number Title of 12(b) Security Title of 12(b) Security Entities [Table] Entities [Table] Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Entity Address, State or Province Entity Address, State or Province Series H Cumulative Redeemable Preferred Shares, $0.01 par value Series H Preferred Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Series G Cumulative Redeemable Preferred Shares, $0.01 par value Series G Preferred Stock [Member] Written Communications Written Communications Entity Information [Line Items] Entity Information [Line Items] Trading Symbol Trading Symbol City Area Code City Area Code Document Period End Date Document Period End Date Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, City or Town Entity Address, City or Town Amendment Flag Amendment Flag Security Exchange Name Security Exchange Name Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] Series F Cumulative Redeemable Preferred Shares, $0.01 par value Series F Preferred Stock [Member] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Central Index Key Entity Central Index Key Entity Emerging Growth Company Entity Emerging Growth Company