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, 2022	Dec. 31, 2021	Dec. 31, 2020
Nonpension postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 731	$ 909	$ 885
Interest cost	3,679	3,755	4,993
Amortization of prior service (credit) cost	0	129	373
Amortization of net actuarial loss	68	4,090	3,198
Net periodic benefit cost (income)	4,478	8,883	9,449
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	55	102	86
Interest cost	44,348	42,434	52,103
Expected return on plan assets	(71,080)	(77,119)	(84,719)
Amortization of net transition asset	0	0	0
Amortization of prior service (credit) cost	(44)	(60)	(60)
Amortization of net actuarial loss	33,164	38,233	32,490
Settlements	394	551	1,364
Net periodic benefit cost (income)	6,837	4,141	1,264
Foreign | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,214	1,528	1,650
Interest cost	13,568	11,811	13,379
Expected return on plan assets	(26,770)	(31,869)	(34,391)
Amortization of net transition asset	0	0	(4)
Amortization of prior service (credit) cost	252	268	245
Amortization of net actuarial loss	6,767	9,350	7,842
Settlements	0	0	5,060
Net periodic benefit cost (income)	$ (4,969)	$ (8,912)	$ (6,219)