Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (572,154)	$ (610,076)	$ (559,026)	$ (603,648)
Other comprehensive income (loss) before reclassifications (3)	(58,745)	13,285	(73,531)	3,913
Amounts reclassified from AOCL	1,184	2,787	2,842	5,731
Other comprehensive income (loss)	(57,561)	16,072	(70,689)	9,644
Ending balance	(629,715)	(594,004)	(629,715)	(594,004)
Foreign currency translation, taxes	(7,299)	(6,401)	(20,605)	(5,747)
Foreign currency translation items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(472,769)	(467,326)	(456,025)	(456,437)
Other comprehensive income (loss) before reclassifications (3)	(64,160)	13,998	(80,904)	3,109
Amounts reclassified from AOCL	0	0	0	0
Other comprehensive income (loss)	(64,160)	13,998	(80,904)	3,109
Ending balance	(536,929)	(453,328)	(536,929)	(453,328)
Pension and other post-retirement effects
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(98,078)	(142,464)	(101,665)	(146,723)
Other comprehensive income (loss) before reclassifications (3)	5,415	(713)	7,373	804
Amounts reclassified from AOCL	1,155	2,772	2,784	5,514
Other comprehensive income (loss)	6,570	2,059	10,157	6,318
Ending balance	(91,508)	(140,405)	(91,508)	(140,405)
Cash flow hedging activity
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,307)	(286)	(1,336)	(488)
Other comprehensive income (loss) before reclassifications (3)	0	0	0	0
Amounts reclassified from AOCL	29	15	58	217
Other comprehensive income (loss)	29	15	58	217
Ending balance	(1,278)	(271)	(1,278)	(271)
Non- controlling Interests
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income (loss)	4	14	1,340	162
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax	5,900	6,100	5,900	6,100	$ 5,900	$ 4,600	$ 6,100	$ 5,900
Non- controlling Interests | Currency Swap
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Foreign currency translation, taxes	$ 26,500	$ 10,000	$ 35,100	$ 9,800