Consolidated Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 15,887	$ (355)	$ 27,052	$ 29,270
Other comprehensive income (loss), gross of tax:
Foreign currency translation adjustments loss	(14,857)	(3,266)	(15,454)	(14,519)
Unrealized (loss) gain on foreign currency derivative securities	(257)	1,753	806	2,304
Unrealized loss on commodity derivative securities				(218)
Other comprehensive loss, gross of tax	(15,114)	(1,513)	(14,648)	(12,433)
Other comprehensive income (loss), related tax effect:
Cumulative effect of accounting change due to ASU 2018-02				(40)
Foreign currency translation adjustments loss	(315)	15	(489)	(217)
Unrealized (loss) gain on foreign currency derivative securities	55	(536)	(177)	(684)
Unrealized loss on commodity derivative securities				(59)
Other comprehensive loss, related tax effect	(260)	(521)	(666)	(1,000)
Other comprehensive loss, net of tax	(15,374)	(2,034)	(15,314)	(13,433)
Comprehensive income (loss)	$ 513	$ (2,389)	$ 11,738	$ 15,837