Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before tax		$ (16,137)			$ 21,562			$ (16,591)	$ 819
Other Comprehensive Income (Loss), income tax		11			(299)			342	(431)
Other Comprehensive Income (Loss), Net of Tax		(16,126)	$ 1,080	$ (1,203)	21,263	$ 17,068	$ (37,943)	(16,249)	388
Foreign Currency Translation Adjustment [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax								(15,352)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax								0
Other Comprehensive Income (Loss), before tax		(16,033)			20,430			(15,352)	(541)
Other Comprehensive Income (Loss), income tax		0			0			0	0
Other Comprehensive Income (Loss), Net of Tax		(16,033)			20,430			(15,352)	(541)
Pension and Other Postretirement Plans [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax								0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(273)			975			(2,042)	2,924
Reclassification from AOCI, Current Period, Tax		50			(263)			528	(789)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(223)			712			(1,514)	2,135
Other Comprehensive Income (Loss), before tax		(273)			975			(2,042)	2,924
Other Comprehensive Income (Loss), income tax		50			(263)			528	(789)
Other Comprehensive Income (Loss), Net of Tax		(223)			712			(1,514)	2,135
Net Prior Service (Credit) Cost [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	793			671			2,377	2,010
Reclassification from AOCI, Current Period, Tax		(188)			(180)			(615)	(542)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		605			491			1,762	1,468
Net Actuarial Gain [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(1,066)			304			(4,419)	914
Reclassification from AOCI, Current Period, Tax		238			(83)			1,143	(247)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(828)			221			(3,276)	667
Cash Flow Hedges [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax								161
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax								456
Other Comprehensive Income (Loss), before tax		169			157			803	(1,564)
Other Comprehensive Income (Loss), income tax		(39)			(36)			(186)	358
Other Comprehensive Income (Loss), Net of Tax		$ 130			$ 121			$ 617	$ (1,206)

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement plan cost (see Note 12) and are included in non-operating pension and postretirement benefit income in the Company’s Condensed Consolidated Statements of Operations.