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Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Jan. 31, 2010
Consolidated Entities [Line Items]
Assets, Current	$ 735,877		$ 735,877		$ 257,232
Impairments of assets	0	$ 0	1,440	$ 1,065
Assets	(4,829,320)		(4,829,320)		(4,350,900)
Liabilities, Current	$ 360,144		$ 360,144		$ 355,071
Subsidiary, Borgata
Consolidated Entities [Line Items]
Equity Method Investment, Ownership Percentage						50.00%

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Consolidated Entities [Line Items]

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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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