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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2017
Dec. 31, 2014
Income Tax Contingency [Line Items]          
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority $ 1,100     $ 2,400  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]          
Unrecognized tax benefit, beginning of year   $ 2,482 $ 2,482   $ 30,198
Tax positions related to current year 0 0 0    
Tax positions related to the Deconsolidation of Borgata 0 0 (27,716)    
Unrecognized tax benefits that would impact effective tax rate 15,800        
Income tax penalties and interest expense 100 6,200      
Income tax penalties and interest accrued 1,000 800      
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities, Portion Which Affected Effective Tax Rate   19,500      
Unrecognized Tax Benefits 2,482 2,482 $ 2,482    
Internal Revenue Service (IRS)          
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]          
Unrecognized tax benefits that would impact effective tax rate $ 2,000        
All years [Member]          
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]          
Settlement with taxing authorities   $ (27,700)