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, 2021	Dec. 31, 2020	Dec. 31, 2019
Nonpension postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 909	$ 885	$ 967
Interest cost	3,755	4,993	6,584
Amortization of prior service (credit) cost	129	373	321
Amortization of net actuarial loss	4,090	3,198	2,026
Net periodic benefit cost (income)	8,883	9,449	9,898
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	102	86	83
Interest cost	42,434	52,103	63,171
Expected return on plan assets	(77,119)	(84,719)	(92,726)
Amortization of net transition asset	0	0	0
Amortization of prior service (credit) cost	(60)	(60)	(60)
Amortization of net actuarial loss	38,233	32,490	26,146
Settlements and curtailments	551	1,364	2,381
Net periodic benefit cost (income)	4,141	1,264	(1,005)
Foreign | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,528	1,650	1,543
Interest cost	11,811	13,379	17,853
Expected return on plan assets	(31,869)	(34,391)	(34,363)
Amortization of net transition asset	0	(4)	(6)
Amortization of prior service (credit) cost	268	245	243
Amortization of net actuarial loss	9,350	7,842	6,337
Settlements and curtailments	0	5,060	397
Net periodic benefit cost (income)	$ (8,912)	$ (6,219)	$ (7,996)