Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,270	$ (3,076)	$ 26,114	$ 30,882
Other comprehensive (loss) income
Changes in cumulative translation adjustment, net of tax	94	(14)	(154)	6
Net unrealized gains on derivative instruments	164	0	454	0
Reclassification of net realized gains on derivative instruments included in net income (loss)	(112)	0	(112)	0
Total change in unrealized gains (losses) realized from cash flow hedges, net of tax	52	0	342	0
Comprehensive income (loss)	$ 1,416	$ (3,090)	$ 26,302	$ 30,888