Consolidated Condensed Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (10,322)	$ 2,751	$ 1,551	$ 11,165
Other comprehensive income (loss):
Foreign currency translation adjustments	5,947	3,480	(2,793)	(771)
Unrealized gain (loss) on foreign currency derivative securities, net of tax	1,139	232	(2,611)	831
Other comprehensive income (loss), net of tax	7,086	3,712	(5,404)	60
Comprehensive (loss) income	$ (3,236)	$ 6,463	$ (3,853)	$ 11,225