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Deconsolidation of Borgata (Narrative) (Details) - Segment [Domain] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Jan. 31, 2010
Consolidated Entities [Line Items]            
Assets, Current $ 230,881   $ 230,881   $ 241,950  
Impairments of assets 0 $ 293 1,065 $ 1,926    
Investment in unconsolidated subsidiary 232,708   232,708   222,717  
Assets (4,419,473)   (4,419,473)   (4,478,924)  
Liabilities, Current $ 340,217   $ 340,217   $ 357,195  
Subsidiary, Borgata            
Consolidated Entities [Line Items]            
Equity Method Investment, Ownership Percentage           50.00%