Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 641,881	$ 560,409	$ 625,643	$ 569,757
Other comprehensive income (loss) before reclassifications	5,323	4,921	4,136	(19,988)
Amounts reclassified from accumulated other comprehensive loss	(417)	(267)	(816)	(8)
Other comprehensive income (loss)	4,906	4,654	3,320	(19,996)
Ending balance	671,881	577,151	671,881	577,151
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(30,607)	(55,913)	(26,597)	(35,459)
Other comprehensive income (loss) before reclassifications	4,566	5,604	556	(14,850)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Other comprehensive income (loss)	4,566	5,604	556	(14,850)
Ending balance	(26,041)	(50,309)	(26,041)	(50,309)
Defined Benefit Plans Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,604)	(5,795)	(6,855)	(5,989)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	252	194	503	388
Other comprehensive income (loss)	252	194	503	388
Ending balance	(6,352)	(5,601)	(6,352)	(5,601)
Gaines (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,701)	(3,780)	(6,874)	610
Other comprehensive income (loss) before reclassifications	757	(683)	3,580	(5,138)
Amounts reclassified from accumulated other comprehensive loss	(669)	(461)	(1,319)	(396)
Other comprehensive income (loss)	88	(1,144)	2,261	(5,534)
Ending balance	(4,613)	(4,924)	(4,613)	(4,924)
AccumulatedOtherComprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(41,912)	(65,488)	(40,326)	(40,838)
Ending balance	$ (37,006)	$ (60,834)	$ (37,006)	$ (60,834)