Investment in Mesquite (Details) - Mesquite - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]
Net operating revenues	$ 25,195	$ 24,332	$ 53,489	$ 50,808
Operating income	2,612	1,842	8,001	5,008
Net income	$ 1,595	$ 731	$ 5,987	$ 2,932