Retirement Plans and Postretirement Medical Benefits (Nonpension Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	$ 133,588
2022	131,658
2023	130,138
2024	125,913
2025	126,921
Thereafter	611,769
Total	1,259,987
Nonpension benefits
Defined Benefit Plan Disclosure [Line Items]
2021	15,332
2022	14,730
2023	14,077
2024	12,995
2025	11,948
Thereafter	50,774
Total	$ 119,856

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=118255775&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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