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Property and Equipment - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property and Equipment    
Property and equipment, at cost $ 3,480,982 $ 3,381,878
Less: accumulated depreciation (788,696) (735,202)
Property and equipment, net 2,692,286 2,646,676
Land    
Property and Equipment    
Property and equipment, at cost 602,879 553,769
Land improvements    
Property and Equipment    
Property and equipment, at cost 7,994 7,994
Buildings    
Property and Equipment    
Property and equipment, at cost 2,414,216 2,355,871
Furniture, fixtures and equipment    
Property and Equipment    
Property and equipment, at cost 423,987 428,991
Construction in progress    
Property and Equipment    
Property and equipment, at cost $ 31,906 $ 35,253