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Summary of Significant Accounting Policies (Other) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 $ 100 $ 1,400 $ 1,100
Self Insurance Reserve [Roll Forward]      
Self insurance reserve, beginning balance 33,004 32,507 30,654
Additions      
Charged to costs and expenses 80,311 80,734 90,903
Payments made (83,247) (80,237) (89,050)
Self insurance reserve, ending balance 30,068 33,004 32,507
Gaming taxes 332,100 330,800 347,500
Advertising expense 33,400 32,200 30,400
Corporate expense $ 76,941 $ 75,626 $ 63,249
Borgata      
Schedule of CRDA Deposits [Line Items]      
Ownership percentage by noncontrolling owners 50.00%