Pension and Other Postretirement Benefits - Change in Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plans
Change in benefit obligation:
Benefit obligation, beginning of year	$ (317,424)	$ (471,834)
Service cost	(2,632)	(3,491)	$ (3,953)
Interest cost	(15,237)	(9,248)	(7,512)
Participant contributions	(435)	(350)
Actuarial gain (loss)	(16,231)	123,851
Acquisitions and divestitures	0	(9,257)
Settlements	2,987	6,567
Other	0	0
Foreign currency exchange rate changes	(12,427)	33,316
Benefits paid	18,640	13,022
Benefit obligation, end of year	(342,759)	(317,424)	(471,834)
Other Plans
Change in benefit obligation:
Benefit obligation, beginning of year	(19,944)	(27,625)
Service cost	(11)	(24)	(33)
Interest cost	(1,012)	(761)	(727)
Participant contributions	(3)	(5)
Actuarial gain (loss)	(1,179)	5,690
Acquisitions and divestitures	0	0
Settlements	0	0
Other	0	(21)
Foreign currency exchange rate changes	(491)	1,409
Benefits paid	1,329	1,393
Benefit obligation, end of year	$ (21,311)	$ (19,944)	$ (27,625)