Retirement Plans and Postretirement Medical Benefits (Nonpension Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2025 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2026	$ 1,037,924
2027	32,847
2028	33,029
2029	33,393
2030	33,092
Thereafter	166,565
Total	1,336,850
Postretirement Medical Benefits
Defined Benefit Plan Disclosure [Line Items]
2026	9,087
2027	8,611
2028	8,192
2029	7,724
2030	7,293
Thereafter	29,855
Total	$ 70,762

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