Consolidated Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 24,791	$ (10,322)	$ 57,700	$ 1,551
Other comprehensive income (loss):
Foreign currency translation adjustments	4,528	5,947	(8,624)	(2,793)
Unrealized (loss) gain on foreign currency derivative securities, net of tax	(48)	1,139	(570)	(2,611)
Other comprehensive income (loss), net of tax	4,480	7,086	(9,194)	(5,404)
Comprehensive income (loss)	$ 29,271	$ (3,236)	$ 48,506	$ (3,853)