Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 50,144	$ 4,616	$ 45,236	$ 15,101
Foreign currency translation, net of tax	1,165	228	(717)	812
Comprehensive income	$ 51,309	$ 4,844	$ 44,519	$ 15,913