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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 37,506	$ 41,899	$ 35,227
Other comprehensive income (loss), gross of tax:
Net (loss) gain on pension benefit obligations	(1,264)	91	244
Foreign currency translation adjustments (loss) gain	(2,415)	(19,212)	48,059
Unrealized gain on foreign currency derivative securities	1,151	1,096	301
Unrealized (loss) gain on commodity derivative securities		(218)	55
Other comprehensive (loss) gain, gross of tax	(2,528)	(18,243)	48,659
Other comprehensive income (loss), related tax effect:
Cumulative effect of accounting change due to ASU 2018-02		(40)
Net gain (loss) on pension benefit obligations	232	(15)	(60)
Foreign currency translation adjustments (loss) gain	(393)	(390)	148
Unrealized loss on foreign currency derivative securities	(252)	(300)	(81)
Unrealized loss on commodity derivative securities		(68)	(19)
Other comprehensive loss, related tax effect	(413)	(813)	(12)
Other comprehensive loss, net of tax	(2,941)	(19,056)	48,647
Comprehensive income	$ 34,565	$ 22,843	$ 83,874

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