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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate and Equipment      
Balance at the beginning of the period $ 7,617,547 $ 7,456,940 $ 6,222,360
Additions 226,105 317,392 1,234,580
Disposals (18,889) (43,809) 0
Impairment   0 0
Reclassification of assets held for sale 0 (112,976)  
Balance at the end of the period 7,824,763 7,617,547 7,456,940
Accumulated Depreciation      
Balance at the beginning of the period 1,270,716 1,147,540 973,205
Additions 193,697 188,445 174,335
Disposals (9,936) (7,974) 0
Impairment   0 0
Reclassification of assets held for sale 0 (57,295)  
Balance at the end of the period $ 1,454,477 $ 1,270,716 $ 1,147,540