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Summary of Significant Accounting Policies (Other) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 $ 1,400
Self Insurance Reserve [Roll Forward]      
Self insurance reserve, beginning balance 30,068 33,004 32,507
Additions      
Charged to costs and expenses 79,685 80,311 80,734
Payments made (78,745) (83,247) (80,237)
Self insurance reserve, ending balance 31,022 30,068 33,004
Gaming taxes 321,700 332,100 330,800
Advertising expense 32,300 33,400 32,200
Corporate expense $ 72,668 $ 76,941 $ 75,626