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Schedule III - REAL ESTATE ASSETS AND ACCUMULATED DEPRECIATION - Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Carrying Amount of Real Estate Investments and Accumulated Depreciation [Roll Forward]      
Balance at beginning of period $ 7,621,930 $ 7,947,647 $ 8,240,521
Additions and improvements 144,256 177,482 263,265
Acquisitions of real estate assets 3,301 78,516 0
Disposals, deconsolidations and accumulated depreciation on impairments (305,813) (506,399) (435,331)
Transfers from real estate assets (11,531) (3,915) (3,986)
Impairment of real estate assets (173,535) (71,401) (116,822)
Balance at end of period 7,278,608 7,621,930 7,947,647
Accumulated depreciation, beginning of period 2,465,095 2,427,108 2,382,568
Depreciation expense 261,838 272,945 272,697
Accumulated depreciation on real estate assets sold, retired, deconsolidated or impaired (233,851) (234,958) (228,157)
Accumulated depreciation, end of period $ 2,493,082 $ 2,465,095 $ 2,427,108