CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 19,375	$ 17,736	$ 68,235	$ 17,009
Gain on foreign currency translation adjustment	2,032	1,323	7,285	1,821
Comprehensive income (loss)	$ 21,407	$ 19,059	$ 75,520	$ 18,830