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Schedule III - Real Estate and Accumulated Depreciation (Reconciliation of Real Estate Investments and Accumulated Depreciation) (Parentheticals) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the Beginning of the Year $ 3,659,886 $ 4,487,588 $ 4,631,128
Additions:      
Acquisitions 62,586 0 182,381
Capital expenditures and assets placed into service 356,857 213,996 165,941
Less:      
Dispositions/impairments/placed into redevelopment (189,395) (962,676) (442,327)
Retirements (57,586) (79,022) (49,535)
Balance at the end of the year 3,832,348 3,659,886 4,487,588
Assets held for sale [1] 0 (73,591) [2] (794,588)
Operating properties 3,832,348 3,586,295 3,693,000
Tax Basis of Assets, Cost for Income Tax Purposes 3,100,000 3,000,000  
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the beginning of the year 885,392 1,080,616 1,078,996
Real Estate Accumulated Depreciation Additions [Abstract]      
Depreciation expense 135,823 131,859 159,080
Real Estate Accumulated Depreciation Less Dispositions [Abstract]      
Dispositions/impairments/placed into redevelopment (74,178) (250,110) (109,243)
Retirements (51,946) (76,973) (48,217)
Balance at the end of the year 895,091 885,392 1,080,616
Assets held for sale 0 (32,916) (213,581)
Real Estate Investment Property, Accumulated Depreciation 895,091 852,476  
Accumulated Depreciation, including HFS [Member]      
Real Estate Accumulated Depreciation Less Dispositions [Abstract]      
Real Estate Investment Property, Accumulated Depreciation $ 895,091 $ 852,476 $ 867,035
[1] As of December 31, 2015, the Och-Ziff Portfolio and Cira Square were held for sale. As of December 31, 2016, the Concord Airport Plaza located in the Other segment and the Calverton portfolio located in the Metropolitan Washington, D.C. segment was held for sale. See Note 3, “Real Estate Investments,” for further information.
[2] Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation, land held for development or other assets on the balance sheets of the properties held for sale. See 2016 Held for Sale section below.