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Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Postretirement Medical Benefits      
Components of the net periodic cost for retirement and postretirement benefits      
Interest cost $ 596 $ 754 $ 779
Amortization of unrecognized net loss (132) (215) (764)
Amortization of unrecognized prior service cost (benefit) 122 122 122
U.S. net pension expense 586 661 137
United States | Pension Plan      
Components of the net periodic cost for retirement and postretirement benefits      
Service cost 25,893 23,245 22,195
Interest cost 15,100 17,584 15,789
Expected return on plan assets (25,794) (25,645) (25,704)
Settlement loss (gain) and other 128 0 (462)
Amortization of unrecognized prior service cost 184 164 164
Amortization of unrecognized net loss 6,977 3,675 5,514
Amortization of unrecognized prior service cost (benefit) 57 211  
U.S. net pension expense 22,488 19,023 17,496
Foreign Plan | Pension Plan      
Components of the net periodic cost for retirement and postretirement benefits      
Service cost 7,052 5,728 7,208
Interest cost 6,572 8,867 8,970
Expected return on plan assets (5,018) (7,535) (8,747)
Settlement loss (gain) and other 708 859 (521)
Amortization of unrecognized net loss 4,315 2,933 3,626
Amortization of unrecognized prior service cost (benefit) 262 265 33
U.S. net pension expense $ 13,891 $ 11,117 $ 10,569