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Summary of Significant Accounting Policies (Consolidation) (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Oct. 04, 2011
Consolidated Entities [Line Items]
Assets	$ 6,038,948,000	$ 5,883,054,000
Restricted investments held by variable interest entity	21,367,000	21,367,000
Borgata
Consolidated Entities [Line Items]
Assets	1,430,000,000	1,440,000,000
LVE
Consolidated Entities [Line Items]
Assets	189,500,000	189,900,000
Assets pledged as security not separately reported	163,800,000	163,805,507
Restricted investments held by variable interest entity	21,367,000	21,367,423
IP Casino Resort Spa
Consolidated Entities [Line Items]
Purchase price			280,600,000
Assets	$ 303,900,000	$ 309,500,000

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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- Definition

The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position.

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