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Acquisitions and Divestitures Asset Divestiture - Borgata (Details) - USD ($)
 3 Months Ended 7 Months Ended 12 Months Ended
Feb. 16, 2017
Aug. 02, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Jul. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                            
Net Revenues     $ 590,832,000 $ 587,665,000 $ 599,868,000 $ 605,342,000 $ 554,823,000 $ 531,901,000 $ 544,874,000 $ 552,378,000   $ 2,383,707,000 $ 2,183,976,000 $ 2,199,432,000
Equity Method Investment, Ownership Percentage     50.00%                 50.00%    
Proceeds from Divestiture of Businesses   $ 900,000,000                        
Proceeds from Divestiture of Businesses, Net of Cash Divested   $ 589,000,000                        
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax                       $ 181,700,000    
Costs and Expenses                       2,040,212,000 1,923,349,000 1,928,230,000
Operating Income (Loss)     $ 80,601,000 78,665,000 89,361,000 94,868,000 29,971,000 67,916,000 80,490,000 82,250,000   343,495,000 260,627,000 271,202,000
Increase (decrease) in fair value of derivative instruments                       173,108,000 212,692,000 224,590,000
Gain Loss on Early Retirements of Debt                       (1,582,000) (42,364,000) (40,733,000)
Income Tax Expense (Benefit)                       3,006,000 (197,486,000) (6,634,000)
Net Income (Loss) Attributable to Parent     $ 82,150,000 $ 22,976,000 $ 48,578,000 $ 35,489,000 $ 12,220,000 $ 342,571,000 $ 30,022,000 $ 33,190,000   $ 189,193,000 418,003,000 47,234,000
Borgata                            
Business Acquisition [Line Items]                            
Net Revenues                     $ 485,510,000     804,166,000
Equity Method Investment, Ownership Percentage     50.00%                 50.00%    
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation                       $ 14,800,000 $ 9,100,000  
Refund From Tax Settlement $ 72,000,000                          
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax                       $ 36,200,000    
Costs and Expenses                     366,812,000     657,324,000
Operating Income (Loss)                     118,698,000     146,842,000
Increase (decrease) in fair value of derivative instruments                     26,378,000     59,681,000
Gain Loss on Early Retirements of Debt                     1,628,000     18,895,000
Income Tax Expense (Benefit)                     8,274,000     (3,731,000)
Net Income (Loss) Attributable to Parent                     $ 82,418,000     $ 71,997,000
MDDHC [Member]                            
Business Acquisition [Line Items]                            
Equity Method Investment, Ownership Percentage     1.00%                 1.00%    
Subsidiaries [Member]                            
Business Acquisition [Line Items]                            
Equity Method Investment, Ownership Percentage     49.00%                 49.00%