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Accumulated Other Comprehensive Loss - Rollforward of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 379,744	$ 288,321	$ 334,619	$ 147,431
Other comprehensive (loss) income, before taxes	(801)	3,364	(5,263)	5,786
Tax benefit	(6)	(2)	(21)	(8)
Other comprehensive (loss) income, net of taxes	(807)	3,362	(5,284)	5,778
Ending balance	7,173	306,583	7,173	306,583
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(27,411)	(26,461)	(22,908)	(28,867)
Other comprehensive (loss) income, before taxes	(812)	3,357	(5,315)	5,763
Tax benefit	0	0	0	0
Other comprehensive (loss) income, net of taxes	(812)	3,357	(5,315)	5,763
Ending balance	(28,223)	(23,104)	(28,223)	(23,104)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(993)	(537)	(1,019)	(547)
Other comprehensive (loss) income, before taxes	11	7	52	23
Tax benefit	(6)	(2)	(21)	(8)
Other comprehensive (loss) income, net of taxes	5	5	31	15
Ending balance	(988)	(532)	(988)	(532)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(28,404)	(26,998)	(23,927)	(29,414)
Other comprehensive (loss) income, net of taxes	(807)	3,362	(5,284)	5,778
Ending balance	$ (29,211)	$ (23,636)	$ (29,211)	$ (23,636)

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