Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 40,582	$ 66,053	$ 79,957
Other comprehensive income before tax and net of reclassification adjustments:
Change in fair value of interest rate swaps		235	789
Change in fair value of available-for-sale securities	32	19	427
Other comprehensive income, before tax	32	254	1,216
Income tax expense related to components of other comprehensive income	13	99	474
Other comprehensive income, net of tax	19	155	742
Comprehensive income	$ 40,601	$ 66,208	$ 80,699