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Pension and Other Postretirement Benefits - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | $ 281,332 | $ 394,026
U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 49,153 | 77,687
Non-U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 51,227 | 77,299
Government bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 56,318 | 64,255
Corporate bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 67,406 | 108,729
Fixed income fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 22,680 | 16,939
Liability driven investment fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 14,629 | 22,713
Other investments |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 10,531 | 15,103
Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 9,388 | 11,301
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 13,019 | 14,451
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 4,384 | 2,913
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 5,393 | 6,267
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government bond fund |  |
Pension And Other Employee Benefit Plans [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 |  |
Pension And Other Employee Benefit Plans [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 |  |
Pension And Other Employee Benefit Plans [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 |  |
Pension And Other Employee Benefit Plans [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 |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 3,242 | 5,271
Significant Observable Inputs (Level 2) |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 9,186 | 12,238
Significant Observable Inputs (Level 2) | U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Non-U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Government bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 2,011 | 731
Significant Observable Inputs (Level 2) | Corporate bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 7,175 | 11,507
Significant Observable Inputs (Level 2) | Fixed income fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Liability driven investment fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Other investments |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Observable Inputs (Level 2) | Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Investments Measured at Net Asset Value |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 259,127 | 359,749
Investments Measured at Net Asset Value | U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 44,769 | 83,047
Investments Measured at Net Asset Value | Non-U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 45,834 | 56,028
Investments Measured at Net Asset Value | Government bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 54,307 | 97,646
Investments Measured at Net Asset Value | Corporate bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 60,231 | 70,284
Investments Measured at Net Asset Value | Fixed income fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 22,680 | 7,320
Investments Measured at Net Asset Value | Liability driven investment fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 14,629 | 22,713
Investments Measured at Net Asset Value | Other investments |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 10,531 | 17,367
Investments Measured at Net Asset Value | Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | $ 6,146 | $ 5,344

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