Pensions and Other Postretirement Benefit Plans (Schedule of (Gains)/Losses Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
(Gains)/losses in plan assets and benefit obligations recognized in other comprehensive income:
Settlements/curtailments	$ (450)	$ (1,494)
Asset/liability loss/(gain)	1,796	(851)	(2,955)
Amortization of actuarial (loss)	(4,480)	(5,175)	(5,439)
Amortization of prior service (cost)/credit	4,420	4,454	4,453
Pension Plans [Member]
(Gains)/losses in plan assets and benefit obligations recognized in other comprehensive income:
Settlements/curtailments	(450)	(1,494)
Asset/liability loss/(gain)	(2,794)	6,411	(4,408)
Amortization of actuarial (loss)	(2,253)	(2,219)	(2,628)
Amortization of prior service (cost)/credit	(68)	(34)	(36)
Currency impact	316	(1,389)	1,930
Cost/(benefit) in other comprehensive income	(5,249)	1,275	(5,142)
Other postretirement benefits [Member]
(Gains)/losses in plan assets and benefit obligations recognized in other comprehensive income:
Settlements/curtailments
Asset/liability loss/(gain)	4,685	(6,100)	2,743
Amortization of actuarial (loss)	(2,227)	(2,956)	(2,811)
Amortization of prior service (cost)/credit	4,488	4,488	4,488
Currency impact			2
Cost/(benefit) in other comprehensive income	$ 6,946	$ (4,568)	$ 4,422