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Pension and Other Postretirement Benefits - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | $ 301,378 | $ 281,332
U.S. equities fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 34,966 | 49,153
Non-U.S. equities fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 35,939 | 51,227
Government bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 77,480 | 56,318
Corporate bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 62,456 | 67,406
Fixed income fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 22,673 | 22,680
Liability driven investment fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 51,412 | 14,629
Other investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 9,565 | 10,531
Cash and equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 6,887 | 9,388
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 2,662 | 13,019
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. equities fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 4,384
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. equities fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 5,393
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Liability driven investment fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 2,662 | 3,242
Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 9,186
Significant Observable Inputs (Level 2) | U.S. equities fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Non-U.S. equities fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Government bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 2,011
Significant Observable Inputs (Level 2) | Corporate bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 7,175
Significant Observable Inputs (Level 2) | Fixed income fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Liability driven investment fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Other investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Cash and equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Investments Measured at Net Asset Value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 298,716 | 259,127
Investments Measured at Net Asset Value | U.S. equities fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 34,966 | 44,769
Investments Measured at Net Asset Value | Non-U.S. equities fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 35,939 | 45,834
Investments Measured at Net Asset Value | Government bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 77,480 | 54,307
Investments Measured at Net Asset Value | Corporate bond fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 62,456 | 60,231
Investments Measured at Net Asset Value | Fixed income fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 22,673 | 22,680
Investments Measured at Net Asset Value | Liability driven investment fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 51,412 | 14,629
Investments Measured at Net Asset Value | Other investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | 9,565 | 10,531
Investments Measured at Net Asset Value | Cash and equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of pension plan assets by asset category | $ 4,225 | $ 6,146

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