Equity Method Investments (Details) (USD $)	3 Months Ended	12 Months Ended			2 Months Ended	12 Months Ended						12 Months Ended					12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 ACDL	Dec. 31, 2012 ACDL Years	Dec. 31, 2011 ACDL	Sep. 30, 2011 ACDL	Dec. 31, 2012 Ameristar	Dec. 31, 2012 Federated Sports and Gaming	Dec. 31, 2012 Retama Partners	Dec. 31, 2012 Lumiere Place	Dec. 31, 2012 Farmworks	Dec. 31, 2012 Line of Credit ACDL	Dec. 31, 2012 Retama Partners	Dec. 31, 2012 Corporate Debt Securities	Dec. 31, 2012 US Army Corp of Engineers	Dec. 31, 2012 Other Assets and Other Accrued Liabilities ACDL	Dec. 31, 2012 Noncontrolling Interest ACDL
Schedule of Equity Method Investments
Gain (Loss) on Sale of Property Plant Equipment		$ (400,000)	$ 3,400,000	$ 2,600,000													$ (2,500,000)
Long-term Purchase Commitment, Amount												50,000,000	2,000,000
Long Term Purchase Commitment, Invested Amount												0
Long Term Purchase Commitment, Invesment Credits		13,000,000										10,000,000
Stock Option Award, Vesting Period						5 years
Equity method investment, ownership percentage																			24.00%
Equity method investment, capital raise pro-rata						30,000,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)					3,400,000	21,600,000
Equity Method Investment, Aggregate Cost, Additional Amount						15,600,000
Equity Method Investment, Capital Raise						60,000,000
Loss from equity method investment	(600,000)	(30,780,000)	(588,000)	0		(5,800,000)
Assets					371,600,000			223,200,000
Liabilities, Current					79,000,000			72,100,000
Liabilities					457,100,000			295,100,000
Assets, Current					62,500,000			23,800,000
Shares, Issued					314,000,000			260,300,000
Equity method investment, aggregate cost								95,000,000
Amortization period of intangible asset						50
Options Vested in Period, Fair Value																		300,000
Capitalized interest costs incurred						8,400,000	3,400,000
Business Acquisition, Contratual rights											50.00%				50.00%
Line of Credit Facility, Maximum Borrowing Capacity									1,400,000,000					175,000,000
Long-term Debt, including current portion	1,224,000,000	1,440,500,000	1,224,000,000											83,700,000
Required Additional Capital						35,000,000
Other than Temporary Impairment Losses						(25,000,000)
Business Acquisition, Percentage															75.50%
Long-term Investments											7,800,000
Business Acquisition, Contingent Consideration, Potential Cash Payment											15,000,000
Business Acquisition, Committed Bridge Loan Amount											2,900,000
Cost of Acquired Entity									2,800,000,000	4,600,000
Held-to-maturity securities	0	4,428,000	0													4,400,000
Held-to-maturity Securities, Noncurrent																4,500,000
Business Acquisition, Cost of Acquired Entity, Cash Paid										$ 4,300,000