Goodwill and other intangible assets (Details) (USD $)	3 Months Ended		12 Months Ended
	Sep. 30, 2010	Jun. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill			$ 69,769,000	$ 70,973,000
Intangible Assets, Net (Excluding Goodwill)		12,600,000	42,400,000	12,600,000
Significant Asset Acquisition, Acquisition Cost			32,500,000
Significant Asset Acquisition, Purchase Price Allocation of Gaming Right			29,800,000
Significant Asset Acquisition, Purchase Price Allocation of Design Plans and Fees			2,700,000
Goodwill and Intangible Asset Impairment		56,000,000
Goodwill, Impairment Loss		21,400,000	0	0	21,438,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		34,600,000
Impairment of Intangible Assets, Finite-lived	200,000
Goodwill, Subsequent Recognition of Deferred Tax Asset			1,204,000	1,204,000	1,204,000
Goodwill Subsequent Recognition of Deferred Tax Asset, Future Reductions			$ 1,200,000