Retirement Plans and Postretirement Medical Benefits (Other Changes in Plan Assets and Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Nonpension postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ (206)	$ (31,512)
Amortization of net actuarial loss	2,249	(68)
Total recognized in other comprehensive income	2,043	(31,580)
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	36,846	15,788
Amortization of net actuarial loss	(17,362)	(33,164)
Amortization of prior service credit (cost)	20	44
Settlements	(771)	(394)
Total recognized in other comprehensive income	18,733	(17,726)
Foreign | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	35,826	2,607
Amortization of net actuarial loss	(2,068)	(6,767)
Amortization of prior service credit (cost)	(286)	(252)
Settlements	25	0
Total recognized in other comprehensive income	$ 33,497	$ (4,412)