Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 26,793	$ 24,918	$ 19,365
Change in fair value of interest rate swap agreements	120	(75)	201
Other comprehensive income (loss), net of tax	120	(75)	201
Comprehensive income	$ 26,913	$ 24,843	$ 19,566