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Schedule III - REAL ESTATE ASSETS AND ACCUMULATED DEPRECIATION - Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Carrying Amount of Real Estate Investments and Accumulated Depreciation [Roll Forward]      
Balance at beginning of period $ 7,278,608,000 $ 7,621,930,000 $ 7,947,647,000
Additions and improvements 129,923,000 144,256,000 177,482,000
Acquisitions of real estate assets 5,700,000 3,301,000 78,516,000
Disposals, deconsolidations and accumulated depreciation on impairments (786,889,000) (305,813,000) (506,399,000)
Transfers to (from) real estate assets 22,573,000 (11,531,000) (3,915,000)
Impairment of real estate assets (238,515,000) (173,535,000) (71,401,000)
Balance at end of period 6,411,400,000 7,278,608,000 7,621,930,000
Accumulated depreciation, beginning of period 2,493,082,000 2,465,095,000 2,427,108,000
Depreciation expense 241,631,000 261,838,000 272,945,000
Accumulated depreciation on real estate assets sold, retired, deconsolidated or impaired (385,309,000) (233,851,000) (234,958,000)
Accumulated depreciation, end of period $ 2,349,404,000 $ 2,493,082,000 $ 2,465,095,000