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Retirement Plans and Postretirement Medical Benefits (Components of Net Periodic Benefit Cost for Defined Benefit Pension Plans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Nonpension postretirement benefit plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 367 $ 731 $ 909
Interest cost 5,031 3,679 3,755
Amortization of prior service (credit) cost 0 0 129
Amortization of net actuarial loss (2,249) 68 4,090
Net periodic benefit (income) cost 3,149 4,478 8,883
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 44 55 102
Interest cost 63,533 44,348 42,434
Expected return on plan assets (86,008) (71,080) (77,119)
Amortization of prior service (credit) cost (20) (44) (60)
Amortization of net actuarial loss 17,362 33,164 38,233
Settlements 771 394 551
Net periodic benefit (income) cost (4,318) 6,837 4,141
Foreign | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 766 1,214 1,528
Interest cost 21,238 13,568 11,811
Expected return on plan assets (29,899) (26,770) (31,869)
Amortization of prior service (credit) cost 286 252 268
Amortization of net actuarial loss 2,068 6,767 9,350
Settlements (25) 0 0
Net periodic benefit (income) cost $ (5,566) $ (4,969) $ (8,912)