Accumulated Other Comprehensive Loss - Amounts Included in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 1,718,256
Other comprehensive income before reclassifications			6,325
Amounts reclassified from accumulated other comprehensive loss			29,399
Other comprehensive (loss) income	$ (30,032)	$ (57,140)	35,724	$ (105,528)
Ending balance	1,781,889	1,693,231	1,781,889	1,693,231
Accumulated other comprehensive loss
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(279,554)	(308,216)	(345,310)	(259,828)
Ending balance	(309,586)	$ (365,356)	(309,586)	$ (365,356)
Unrecognized Net Defined Benefit Plan Costs
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(156,733)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			5,518
Other comprehensive (loss) income			5,518
Ending balance	(151,215)		(151,215)
Change in Fair Value of Derivatives
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(772)
Other comprehensive income before reclassifications			4,938
Amounts reclassified from accumulated other comprehensive loss			292
Other comprehensive (loss) income			5,230
Ending balance	4,458		4,458
Foreign Currency Translation
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(187,805)
Other comprehensive income before reclassifications			1,387
Amounts reclassified from accumulated other comprehensive loss			23,589
Other comprehensive (loss) income			24,976
Ending balance	$ (162,829)		$ (162,829)