Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		$ 938,425	$ 934,336
Other comprehensive income (loss) before reclassifications		97	(14,903)
Amounts reclassified from OCI		(334)	(236)
Ending balance		961,710	925,646
Accumulated Other Comprehensive (Loss) Income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(174,628)	(159,091)
Ending balance		(174,865)	(174,230)
Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	[1]	206	749
Other comprehensive income (loss) before reclassifications	[1]	242	720
Amounts reclassified from OCI	[1]	(342)	(289)
Ending balance	[1]	106	1,180
Pension Items [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	[1]	(353)	(1,965)
Other comprehensive income (loss) before reclassifications	[1]	0	0
Amounts reclassified from OCI	[1]	8	52
Ending balance	[1]	(345)	(1,913)
Foreign Currency Items [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(174,481)	(157,875)
Other comprehensive income (loss) before reclassifications		(145)	(15,623)
Amounts reclassified from OCI		0	1
Ending balance		$ (174,626)	$ (173,497)

[1] Cash Flow Hedges and Pension Items are net of tax.