Retirement Plans and Postretirement Medical Benefits (Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
United States
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 1,609,508	$ 1,729,638
Accumulated benefit obligation	1,609,125	1,729,194
Fair value of plan assets	1,549,157	1,601,000
Foreign
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	59,859	691,909
Accumulated benefit obligation	59,352	690,887
Fair value of plan assets	$ 0	$ 577,821

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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