CONSOLIDATED COMPREHENSIVE INCOME (LOSS) STATEMENTS - 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)	$ (5,061)	$ 22,659	$ (6,066)	$ 22,072
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(1,833)	(5,058)	(100)	(1,412)
Comprehensive income (loss)	$ (6,894)	$ 17,601	$ (6,166)	$ 20,660