Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Postretirement Medical Benefits
Components of the net periodic cost for retirement and postretirement benefits
Interest cost	$ 678	$ 761	$ 464
Amortization of unrecognized net (gain) loss	69	53	192
U.S. net pension expense	869	936	778
United States | Pension Plan
Components of the net periodic cost for retirement and postretirement benefits
Service cost	23,935	21,341	24,680
Interest cost	20,759	20,480	13,157
Expected return on plan assets	(23,235)	(23,931)	(25,345)
Settlement (gain) loss and other	0	15	0
Amortization of unrecognized prior service cost	194	185	175
Amortization of unrecognized net (gain) loss	0	(13)	3,461
U.S. net pension expense	21,653	18,077	16,128
Foreign Plan | Pension Plan
Components of the net periodic cost for retirement and postretirement benefits
Service cost	6,381	4,611	5,984
Interest cost	12,401	11,897	6,506
Expected return on plan assets	(7,740)	(6,659)	(5,883)
Settlement (gain) loss and other	(63)	(23)	(75)
Amortization of unrecognized net (gain) loss	2,561	1,270	2,729
U.S. net pension expense	$ 13,836	$ 11,396	$ 9,554