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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate and Equipment      
Balance at the beginning of the period $ 7,824,763 $ 7,617,547 $ 7,456,940
Additions 242,270 226,105 317,392
Disposals (17,923) (18,889) (43,809)
Impairment (46,797)    
Cost basis adjustment (122,711)    
Reclassification of assets held for sale (3,302)   (112,976)
Balance at the end of the period 7,876,300 7,824,763 7,617,547
Accumulated Depreciation      
Balance at the beginning of the period 1,454,477 1,270,716 1,147,540
Additions 205,117 193,697 188,445
Disposals (1,101) (9,936) (7,974)
Impairment 0    
Cost basis adjustment (122,711)    
Reclassification of assets held for sale (1,390)   (57,295)
Balance at the end of the period $ 1,534,392 $ 1,454,477 $ 1,270,716