Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before tax		$ (18,604)			$ (6,076)			$ (23,403)	$ (29,587)
Other Comprehensive Income (Loss), income tax		518			874			1,512	1,976
Other Comprehensive Income (Loss), Net of Tax		(18,086)	$ (12,095)	$ 8,290	(5,202)	$ (33,221)	$ 10,812	(21,891)	(27,611)
Foreign Currency Translation Adjustment [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax								(17,755)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax								0
Other Comprehensive Income (Loss), before tax		(16,684)			(2,844)			(17,755)	(22,447)
Other Comprehensive Income (Loss), income tax		0			0			0	0
Other Comprehensive Income (Loss), Net of Tax		(16,684)			(2,844)			(17,755)	(22,447)
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		(1,443)			(3,226)			(4,744)	(7,741)
Reclassification from AOCI, Current Period, Tax		390			873			1,281	2,090
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(1,053)			(2,353)			(3,463)	(5,651)
Other Comprehensive Income (Loss), before tax		(1,443)			(3,226)			(4,744)	(7,741)
Other Comprehensive Income (Loss), income tax		390			873			1,281	2,090
Other Comprehensive Income (Loss), Net of Tax		(1,053)			(2,353)			(3,463)	(5,651)
Net Prior Service (Credit) Cost [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(932)			69			(3,210)	215
Reclassification from AOCI, Current Period, Tax		252			(18)			867	(58)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(680)			51			(2,343)	157
Net Actuarial Gain [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(511)			(3,295)			(1,534)	(7,956)
Reclassification from AOCI, Current Period, Tax		138			891			414	2,148
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(373)			(2,404)			(1,120)	(5,808)
Cash Flow Hedges [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax								(562)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax								(111)
Other Comprehensive Income (Loss), before tax		(477)			(6)			(904)	601
Other Comprehensive Income (Loss), income tax		128			1			231	(114)
Other Comprehensive Income (Loss), Net of Tax		$ (349)			$ (5)			$ (673)	$ 487

[1] These accumulated other comprehensive income components are components 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.