Investment in Mesquite (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Equity Method Investments [Line Items]
Operating income	$ 8,797	$ 7,214	$ 15,788	$ 13,813
Net Income (loss)	4,845	3,320	7,898	5,849
Mesquite
Schedule of Equity Method Investments [Line Items]
Net operating revenues	24,546	26,034	51,544	54,497
Operating income	2,403	153	6,699	3,269
Net Income (loss)	$ 4,318	$ (1,369)	$ 7,149	$ 263