CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 23,292	$ 16,638
Other comprehensive income (loss):
Cash flow hedges, net of $0 tax in all periods	54	(42)
Foreign currency translation adjustment, net of $0 tax in all periods	(2,910)	2,790
Other comprehensive income (loss)	(2,856)	2,748
Comprehensive income	$ 20,436	$ 19,386