CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Comprehensive income:
Net income	$ 12,625	$ 12,512	$ 30,256	$ 34,779
Derivative instruments:
Reclassification of losses to net income, net of tax of $12 and $25 for each of the three and six months ended June 30, 2016 and 2015, respectively	19	19	38	38
Other comprehensive income	19	19	38	38
Comprehensive income	$ 12,644	$ 12,531	$ 30,294	$ 34,817