Retirement Plans and Postretirement Medical Benefits (Nonpension Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2024	$ 123,016
2025	123,566
2026	121,323
2027	120,468
2028	120,025
Thereafter	576,290
Total	1,184,688
Postretirement Medical Benefits
Defined Benefit Plan Disclosure [Line Items]
2024	10,514
2025	10,065
2026	9,626
2027	9,130
2028	8,654
Thereafter	36,181
Total	$ 84,170

Defined Benefit Plan, Expected Future Benefit Payments

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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
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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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 second fiscal year following current fiscal year.

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