Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (748,742)	$ (646,568)
Other comprehensive income (loss) before reclassifications (3)	46,037	(27,727)
Amounts reclassified from AOCL	1,892	854
Other comprehensive income (loss)	47,929	(26,873)
Ending balance	(700,813)	(673,441)
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax	(7,300)	(7,200)	$ (7,300)	$ (7,000)
Foreign currency translation items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(632,097)	(523,873)
Other comprehensive income (loss) before reclassifications (3)	47,571	(28,244)
Amounts reclassified from AOCL	0	0
Other comprehensive income (loss)	47,571	(28,244)
Ending balance	(584,526)	(552,117)
Pension and other post-retirement effects
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(115,898)	(121,882)
Other comprehensive income (loss) before reclassifications (3)	(1,534)	517
Amounts reclassified from AOCL	1,868	859
Other comprehensive income (loss)	334	1,376
Ending balance	(115,564)	(120,506)
Cash flow hedging activity
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(747)	(813)
Other comprehensive income (loss) before reclassifications (3)	0	0
Amounts reclassified from AOCL	24	(5)
Other comprehensive income (loss)	24	(5)
Ending balance	$ (723)	$ (818)