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Pension Plans and Other Postretirement Benefits - Financial Assets Accounted for at Fair Value on Recurring Basis (Details) - Pension Plans - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 539,712 | $ 549,645
Fair Value, Inputs, Level 1, 2 and 3 | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 78,124 | 58,906
Fair Value, Inputs, Level 1, 2 and 3 | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 78,124 | 106,491
Fair Value, Inputs, Level 1, 2 and 3 | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 318,036 | 294,140
Fair Value, Inputs, Level 1, 2 and 3 | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,540 | 9,566
Quoted Prices in Active Markets for Identical Items (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 442,684 | 425,203
Quoted Prices in Active Markets for Identical Items (Level 1) | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 78,124 | 58,906
Quoted Prices in Active Markets for Identical Items (Level 1) | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 69,471 | 99,432
Quoted Prices in Active Markets for Identical Items (Level 1) | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 286,549 | 257,299
Quoted Prices in Active Markets for Identical Items (Level 1) | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,540 | 9,566
Quoted Prices in Active Markets for Similar Items (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 40,140 | 43,900
Quoted Prices in Active Markets for Similar Items (Level 2) | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Quoted Prices in Active Markets for Similar Items (Level 2) | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,653 | 7,059
Quoted Prices in Active Markets for Similar Items (Level 2) | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,487 | 36,841
Quoted Prices in Active Markets for Similar Items (Level 2) | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Unobservable Inputs (Level 3) | Domestic Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Unobservable Inputs (Level 3) | International Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Unobservable Inputs (Level 3) | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Unobservable Inputs (Level 3) | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Absolute Return Measured at Net Asset Value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 56,888 | $ 80,542

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