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Deconsolidation of Certain Interests (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 31, 2010
Consolidated Entities [Line Items]
Assets, Current		$ 307,947	$ 257,232
Equity Method Investment, Ownership Percentage		50.00%
Impairments of assets	$ 12,100	$ 38,302	18,565	$ 48,681
Assets		4,670,751	4,350,900
Liabilities, Current		365,504	355,071
Other long-term liabilities		$ 172,002	248,019
Borgata
Consolidated Entities [Line Items]
Equity Method Investment, Ownership Percentage		50.00%
Borgata
Consolidated Entities [Line Items]
Equity Method Investment, Ownership Percentage					50.00%
Segment Reconciling Items [Member]
Consolidated Entities [Line Items]
Impairments of assets		$ 38,302	$ 18,565	$ 48,681

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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