Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (620,787)	$ (629,715)	$ (641,972)	$ (559,026)
Other comprehensive income (loss) before reclassifications (3)	(40,315)	(81,321)	(18,180)	(147,862)
Amounts reclassified from AOCL	(462)	(1,771)	(1,412)	(5,920)
Other comprehensive income (loss)	(40,777)	(83,092)	(19,592)	(153,782)
Ending balance	(661,564)	(712,808)	(661,564)	(712,808)
Foreign currency translation, taxes	904	(3,183)	1,458	(23,788)
As Reported
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Ending balance		(712,807)		(712,807)
Foreign currency translation items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(532,276)	(536,929)	(554,683)	(456,025)
Other comprehensive income (loss) before reclassifications (3)	(43,012)	(89,282)	(20,605)	(170,187)
Amounts reclassified from AOCL	0	0	0	0
Other comprehensive income (loss)	(43,012)	(89,282)	(20,605)	(170,187)
Ending balance	(575,288)	(626,212)	(575,288)	(626,212)
Foreign currency translation items | As Reported
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Ending balance		(626,211)		(626,211)
Pension and other post-retirement effects
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(87,638)	(91,508)	(86,356)	(101,665)
Other comprehensive income (loss) before reclassifications (3)	2,697	7,961	2,425	22,325
Amounts reclassified from AOCL	(492)	(1,800)	(1,502)	(6,007)
Other comprehensive income (loss)	2,205	6,161	923	16,318
Ending balance	(85,433)	(85,347)	(85,433)	(85,347)
Pension and other post-retirement effects | As Reported
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Ending balance		(85,347)		(85,347)
Cash flow hedging activity
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(873)	(1,278)	(933)	(1,336)
Other comprehensive income (loss) before reclassifications (3)	0	0	0	0
Amounts reclassified from AOCL	30	29	90	87
Other comprehensive income (loss)	30	29	90	87
Ending balance	(843)	(1,249)	(843)	(1,249)
Cash flow hedging activity | As Reported
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Ending balance		(1,249)		(1,249)
Non- controlling Interests
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income (loss)	(4,811)	(91)	(7,727)	1,248
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax	$ (1,900)	5,800	$ (1,900)	5,800	$ 2,900	$ 5,800	$ 5,900	$ 4,600
Non- controlling Interests | Currency Swap
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Foreign currency translation, taxes		$ 21,300		$ 56,300