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Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Postretirement Medical Benefits      
Components of the net periodic cost for retirement and postretirement benefits      
Interest cost $ 464 $ 399 $ 596
Amortization of unrecognized net loss 192 (21) (132)
U.S. net pension expense 778 500 586
United States | Pension Plan      
Components of the net periodic cost for retirement and postretirement benefits      
Service cost 24,680 25,162 25,893
Interest cost 13,157 11,952 15,100
Expected return on plan assets (25,345) (25,377) (25,794)
Settlement loss and other 0 0 128
Amortization of unrecognized prior service cost 175 188 184
Amortization of unrecognized net loss 3,461 7,725 6,977
U.S. net pension expense 16,128 19,650 22,488
Foreign Plan | Pension Plan      
Components of the net periodic cost for retirement and postretirement benefits      
Service cost 5,984 7,336 7,052
Interest cost 6,506 5,544 6,572
Expected return on plan assets (5,883) (6,204) (5,018)
Settlement loss and other (75) 640 708
Amortization of unrecognized net loss 2,729 4,509 4,315
U.S. net pension expense $ 9,554 $ 12,125 $ 13,891