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Summary of Significant Accounting Policies (Organization) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
entity
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Organization Attributes [Line Items]        
Subsidiaries, Ownership Percentage 80.00%      
Interest Costs Capitalized   $ 500 $ 100  
Income Tax Expense (Benefit) $ 3,115 (199,933) (6,625)  
Number of Gaming Entertainment Properties | entity 24      
Number of reportable segments | segment 3      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 1,097,227 930,180 $ 501,837 $ 438,087
Deferred income taxes (86,657) (81,454)    
Accrued liabilities 255,146 $ 257,554    
Adjustments for Change in Accounting Principle [Domain]        
Organization Attributes [Line Items]        
Income Tax Expense (Benefit) $ 1,500