Retirement Plans and Postretirement Medical Benefits (Other Changes in Plan Assets and Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Nonpension postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss	$ (22,305)	$ 11,496
Amortization of net actuarial loss	(4,090)	(3,198)
Amortization of prior service credit (cost)	(129)	(373)
Total recognized in other comprehensive income	(26,524)	7,925
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss	(27,842)	44,216
Amortization of net actuarial loss	(38,233)	(32,490)
Amortization of prior service credit (cost)	60	60
Net transition asset	0	0
Settlements and curtailments	(551)	(1,364)
Total recognized in other comprehensive income	(66,566)	10,422
Foreign | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss	(23,257)	32,103
Amortization of net actuarial loss	(9,350)	(7,842)
Amortization of prior service credit (cost)	(268)	(245)
Net transition asset	0	4
Settlements and curtailments	0	(5,060)
Total recognized in other comprehensive income	$ (32,875)	$ 18,960