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Asset Acquisitions Real Estate Disposition (Details) - USD ($)
$ in Thousands
 3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Feb. 16, 2017
Aug. 02, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jul. 31, 2016
Sep. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net Revenues     $ 554,823 $ 531,901 $ 544,874 $ 552,378 $ 542,674 $ 546,313 $ 559,867 $ 550,578     $ 2,183,976 $ 2,199,432 $ 2,142,255
Equity Method Investment, Ownership Percentage     50.00%                   50.00%    
Disposition of Echelon [Abstract]                              
Proceeds from Divestiture of Businesses   $ 900,000                          
Proceeds from Divestiture of Businesses, Net of Cash Divested   $ 589,000                          
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax                         $ 181,700    
Disposition of Dania Jai Alai [Abstract]                              
Investments in subsidiaries     $ 0       0         $ 221,400 0 0  
Impairments of assets                       $ 12,100 38,302 18,565 48,681
Costs and Expenses                         1,923,349 1,928,230 1,968,523
Operating Income (Loss)     29,971 67,916 80,490 82,250 46,802 69,423 83,094 71,883     260,627 271,202 173,732
Interest expense, net of amounts capitalized                         212,692 224,590 230,060
Gain Loss on Early Retirements of Debt                         (42,364) (40,733) (1,536)
Income Tax Expense (Benefit)                         (197,486) (6,634) (5,408)
Net Income (Loss) Attributable to Parent     $ 12,220 $ 342,571 $ 30,022 $ 33,190 $ (6,869) $ 25,425 $ (6,425) $ 35,103     $ 418,003 47,234 (53,041)
Borgata                              
Net Revenues                     $ 485,510     804,166 179,147
Equity Method Investment, Ownership Percentage     50.00%                   50.00%    
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation                         $ 9,100    
Refund From Tax Settlement $ 72,000                            
Disposition of Dania Jai Alai [Abstract]                              
Costs and Expenses                     366,812     657,324 157,896
Operating Income (Loss)                     118,698     146,842 21,251
Interest expense, net of amounts capitalized                     26,378     59,681 17,431
Gain Loss on Early Retirements of Debt                     1,628     18,895 740
Income Tax Expense (Benefit)                     8,274     (3,731) 446
Net Income (Loss) Attributable to Parent                     $ 82,418     $ 71,997 $ 2,634
MDDHC [Member]                              
Equity Method Investment, Ownership Percentage     1.00%                   1.00%    
Subsidiaries [Member]                              
Equity Method Investment, Ownership Percentage     49.00%                   49.00%