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Commitments and contingencies (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]
East Chicago Local Development Agreement Liability	$ 674,000	$ 27,988,000
Liability for Unpaid Claims and Claims Adjustment Expense, Reported and Incurred but Not Reported (IBNR) Claims	9,400,000	10,800,000
Development District Revenue Bonds	9,000,000
Letters of Credit Outstanding, Amount	4,000,000
Operating segment - Ameristar Kansas City [Member]
Commitments and Contingencies Disclosure [Line Items]
Letters of Credit Outstanding, Amount	2,600,000
Notes, Loans and Financing Receivable, Net	$ 2,000,000

The accrued obligation as of the balance sheet date which represents the cost of settling insured claims and insured claims relating to insured events that have occurred but have not yet been reported to the insurer or reinsurer as of the date of the financial statements.

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