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Schedule III - REAL ESTATE ASSETS AND ACCUMULATED DEPRECIATION Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Carrying Amount of Real Estate Investments and Accumulated Depreciation [Roll Forward]      
Balance at beginning of period $ 8,187,183 $ 8,123,514 $ 8,301,013
Additions and improvements 230,990 282,282 282,664
Acquisitions of real estate assets 182,747 0 29,912
Disposals and accumulated depreciation on impairments (249,716) (189,372) (412,976)
Transfers from real estate assets (4,738) (11,383) (8,031)
Impairment of real estate assets (105,945) (17,858) (69,068)
Balance at end of period 8,240,521 8,187,183 8,123,514
Accumulated depreciation, beginning of period 2,240,007 2,056,357 1,972,031
Depreciation expense 274,544 269,602 253,142
Accumulated depreciation on real estate assets sold, retired or impaired (131,983) (85,952) (168,816)
Accumulated depreciation, end of period $ 2,382,568 $ 2,240,007 $ 2,056,357