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Summary of Significant Accounting Policies (Other) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of CRDA Deposits [Line Items]      
Cash and cash equivalents, maturity of qualifying investments, maximum 3 months    
Restricted cash, maturity of qualifying investments, maximum 90 days    
Interest Costs Capitalized   $ 500 $ 100
Self Insurance Reserve [Roll Forward]      
Self insurance reserve, beginning balance $ 31,022 30,068 33,004
Additions      
Charged to costs and expenses 84,209 79,685 80,311
Due to acquisitions 0 14 0
Payments made (81,236) (78,745) (83,247)
Self insurance reserve, ending balance 33,995 31,022 30,068
Gaming taxes 324,500 321,700 332,100
Advertising expense 29,900 32,300 33,400
Corporate expense $ 88,148 $ 72,668 $ 76,941