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Property and Equipment - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property and Equipment    
Property and equipment, at cost $ 3,669,050 $ 3,480,982
Less: accumulated depreciation (866,161) (788,696)
Property and equipment, net 2,802,889 2,692,286
Land    
Property and Equipment    
Property and equipment, at cost 617,695 602,879
Land improvements    
Property and Equipment    
Property and equipment, at cost 7,994 7,994
Buildings and site improvements    
Property and Equipment    
Property and equipment, at cost 2,555,547 2,414,216
Furniture, fixtures and equipment    
Property and Equipment    
Property and equipment, at cost 469,141 423,987
Construction in progress    
Property and Equipment    
Property and equipment, at cost $ 18,673 $ 31,906