Intangible Assets (Changes in Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	$ 81,052
Amortization	(16,366)	$ (26,693)	$ (34,353)
Balance, end of period	73,166	81,052
Indefinite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	809,002
Balance, end of period	808,788	809,002
Intangible Assets [Roll Forward]
Balance, beginning of period	890,054	934,249	1,010,660
Additions	32,680	0	14
Amortization	(16,366)	(26,693)	(34,353)
Balance, end of period	881,954	890,054	934,249
Impairment of Intangible Assets (Excluding Goodwill)	24,400	17,502	40,072
Trademarks
Finite-lived Intangible Assets [Roll Forward]
Amortization	0	0
Indefinite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	126,001	126,001	128,287
Additions	24,200	0	14
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	800	0
Balance, end of period	149,387	126,001	126,001
Intangible Assets [Roll Forward]
Amortization	0	0
Gaming License Rights
Finite-lived Intangible Assets [Roll Forward]
Amortization	0	0	0
Indefinite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	683,001	700,503	740,275
Additions	0	0	0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	23,600	17,502	39,772
Balance, end of period	659,401	683,001	700,503
Intangible Assets [Roll Forward]
Amortization	0	0	0
Customer Relationships
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	26,306	51,958	85,267
Additions	8,480	0	0
Impairments	0	0	0
Amortization	(15,324)	(25,652)	(33,309)
Balance, end of period	19,462	26,306	51,958
Intangible Assets [Roll Forward]
Amortization	(15,324)	(25,652)	(33,309)
Favorable Lease Rates
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	33,373	34,414	35,458
Additions	0	0	0
Impairments	0	0	0
Amortization	(1,042)	(1,041)	(1,044)
Balance, end of period	32,331	33,373	34,414
Intangible Assets [Roll Forward]
Amortization	(1,042)	(1,041)	(1,044)
Development Agreement
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	21,373	21,373	21,373
Additions	0	0	0
Impairments	0	0	0
Amortization	0	0	0
Balance, end of period	21,373	21,373	21,373
Intangible Assets [Roll Forward]
Amortization	0	0	0
Borgata
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)			(2,000)
Borgata \| Gaming License Rights
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)			0
Borgata \| Customer Relationships
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)			0
Borgata \| Favorable Lease Rates
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)			0
Borgata \| Development Agreement
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)			0
Subsidiaries [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)	(14)
Subsidiaries [Member] \| Trademarks
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)	(14)
Subsidiaries [Member] \| Gaming License Rights
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)	0
Subsidiaries [Member] \| Customer Relationships
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)	0
Subsidiaries [Member] \| Favorable Lease Rates
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)	0
Subsidiaries [Member] \| Development Agreement
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)	0
Midwest and South \| Trademarks
Indefinite-lived Intangible Assets [Roll Forward]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	800
Midwest and South \| Gaming License Rights
Indefinite-lived Intangible Assets [Roll Forward]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 23,600	$ 17,500
Peninsula \| Trademarks
Finite-lived Intangible Assets [Roll Forward]
Amortization			0
Indefinite-lived Intangible Assets [Roll Forward]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			300
Intangible Assets [Roll Forward]
Amortization			0
Peninsula \| Borgata \| Trademarks
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Period Increase (Decrease)			$ (2,000)

Intangible Assets, Acquired During Period (Excluding Goodwill)

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Intangible Assets [Line Items]

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Intangible Assets [Roll Forward]

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No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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No definition available.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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