Investment in Eldorado Financial Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]
Operating income	$ 5,214	$ 6,816	$ 21,002	$ 20,629
Net income	1,306	1,973	9,204	7,822
Eldorado
Schedule of Equity Method Investments [Line Items]
Net operating revenues	$ 63,631	$ 65,907	$ 191,638	$ 194,771