Retirement Plans and Postretirement Medical Benefits (Nonpension Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2022	$ 130,497
2023	131,204
2024	124,812
2025	125,765
2026	123,679
Thereafter	601,374
Total	1,237,331
Nonpension benefits
Defined Benefit Plan Disclosure [Line Items]
2022	12,854
2023	12,338
2024	11,819
2025	11,299
2026	10,778
Thereafter	45,383
Total	$ 104,471

Defined Benefit Plan, Expected Future Benefit Payments

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+ References

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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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