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Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Jul. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Jul. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Jan. 31, 2010
Consolidated Entities [Line Items]
Assets, Current		$ 270,300			$ 270,300		$ 257,232
Impairments of assets		0	$ 0		1,440	$ 1,065
Assets		(4,456,654)			(4,456,654)		(4,350,900)
Liabilities, Current		$ 389,103			$ 389,103		$ 355,071
Subsidiary, Borgata
Consolidated Entities [Line Items]
Net revenues	$ 91,870		237,461	$ 485,510		611,213
Equity Method Investment, Ownership Percentage								50.00%
Operating expenses	63,997		175,248	366,812		495,473
Operating income	27,873		62,213	118,698		115,740
Equity Method Investment, Summarized Financial Information, Non-operating Expenses	(6,104)		25,363	(36,280)		58,909
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$ 21,769		$ 36,850	$ 82,418		$ 56,831
MDDHC [Member]
Consolidated Entities [Line Items]
Equity Method Investment, Ownership Percentage								1.00%
Subsidiaries [Member]
Consolidated Entities [Line Items]
Equity Method Investment, Ownership Percentage								49.00%

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