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Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Postretirement Medical Benefits      
Components of the net periodic cost for retirement and postretirement benefits      
Interest cost $ 761 $ 464 $ 399
Amortization of unrecognized net (gain) loss 53 192 (21)
U.S. net pension expense 936 778 500
United States | Pension Plan      
Components of the net periodic cost for retirement and postretirement benefits      
Service cost 21,341 24,680 25,162
Interest cost 20,480 13,157 11,952
Expected return on plan assets (23,931) (25,345) (25,377)
Settlement (gain) loss and other 15 0 0
Amortization of unrecognized prior service cost 185 175 188
Amortization of unrecognized net (gain) loss (13) 3,461 7,725
U.S. net pension expense 18,077 16,128 19,650
Foreign Plan | Pension Plan      
Components of the net periodic cost for retirement and postretirement benefits      
Service cost 4,611 5,984 7,336
Interest cost 11,897 6,506 5,544
Expected return on plan assets (6,659) (5,883) (6,204)
Settlement (gain) loss and other (23) (75) 640
Amortization of unrecognized net (gain) loss 1,270 2,729 4,509
U.S. net pension expense $ 11,396 $ 9,554 $ 12,125