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Asset Acquisitions (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended
	Aug. 02, 2016	Sep. 30, 2011	Dec. 31, 2015	Dec. 31, 2014	Jan. 31, 2010
Business Acquisition [Line Items]
Equity method investment, ownership percentage			50.00%
Goodwill, net			$ 685,310	$ 685,310
Other Acquisitions
Refund from Tax Settlement	$ 160,000
Minimum
Other Acquisitions
Obligation to fund certain pre-development costs, annual amount			1,000
Maximum
Other Acquisitions
Obligation to fund certain pre-development costs, annual amount			2,000
Development Agreement
Business Acquisition [Line Items]
Purchase price		$ 24,500
Peninsula
Business Acquisition [Line Items]
Goodwill, net			$ 471,734
Parent Only [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage					49.00%
MDDHC [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage					1.00%
Borgata [Member]
Other Acquisitions
Refund from Tax Settlement	$ 140,000

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Other Acquisitions [Abstract]

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Unrecorded Commitment to Fund Pre-development Costs, Annual Amount

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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