Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Comprehensive Income
Net income	$ 27,148	$ 17,754	$ 12,886
Other comprehensive income (loss)
Mark to market of foreign exchange hedges, net of tax expense (benefit) of $155 and $(129) for 2017 and 2016, respectively	309	(223)
Mark to market of interest rate hedges, net of tax expense of $241 for 2015			422
Minimum pension liability adjustments, net of tax expense of $344 for 2015			602
Total other comprehensive income (loss)	309	(223)	1,024
Comprehensive (loss) income	$ 27,457	$ 17,531	$ 13,910