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Pension and Other Postretirement Benefits - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | $ 394,026 | $ 361,802
U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 77,687 | 86,059
Non-U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 77,299 | 61,630
Government bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 64,255 | 98,418
Corporate bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 108,729 | 82,434
Fixed income fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 16,939 | 7,320
Liability driven investment fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 22,713 | 0
Other investments |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 15,103 | 17,367
Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 11,301 | 8,574
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 | 14,451 | 11,844
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 | 2,913 | 3,012
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 | 6,267 | 5,602
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 | 5,271 | 3,230
Significant Observable Inputs (Level 2) |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 12,238 | 12,922
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 | 731 | 772
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 | 11,507 | 12,150
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
Fair Value Measured at Net Asset Value Per Share |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 367,337 | 337,036
Fair Value Measured at Net Asset Value Per Share | U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 74,774 | 83,047
Fair Value Measured at Net Asset Value Per Share | Non-U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 71,032 | 56,028
Fair Value Measured at Net Asset Value Per Share | Government bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 63,524 | 97,646
Fair Value Measured at Net Asset Value Per Share | Corporate bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 97,222 | 70,284
Fair Value Measured at Net Asset Value Per Share | Fixed income fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 16,939 | 7,320
Fair Value Measured at Net Asset Value Per Share | Liability driven investment fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 22,713 | 0
Fair Value Measured at Net Asset Value Per Share | Other investments |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 15,103 | 17,367
Fair Value Measured at Net Asset Value Per Share | Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 6,030 | $ 5,344
Significant Unobservable Inputs (Level 3) |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 367,337 |
Significant Unobservable Inputs (Level 3) | U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 74,774 |
Significant Unobservable Inputs (Level 3) | Non-U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 71,032 |
Significant Unobservable Inputs (Level 3) | Government bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 63,524 |
Significant Unobservable Inputs (Level 3) | Corporate bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 97,222 |
Significant Unobservable Inputs (Level 3) | Fixed income fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 16,939 |
Significant Unobservable Inputs (Level 3) | Liability driven investment fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 22,713 |
Significant Unobservable Inputs (Level 3) | Other investments |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 15,103 |
Significant Unobservable Inputs (Level 3) | Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | $ 6,030 |

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