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Pension and Other Postretirement Benefits - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | $ 361,802 | $ 355,726
U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 86,059 | 131,563
Non-U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 61,630 | 54,496
Government bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 98,418 | 74,219
Corporate bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 82,434 | 40,940
Fixed income fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 7,320 | 35,895
Other investments |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 17,367 | 9,462
Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 8,574 | 9,151
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 | 11,844 | 8,909
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 | 3,012 | 2,793
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 | 5,602 | 5,949
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) | 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 | 3,230 | 167
Significant Observable Inputs (Level 2) |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 12,922 | 44,300
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 | 772 | 745
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 | 12,150 | 9,854
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 | 33,701
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 | 337,036 | 302,517
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 | 83,047 | 128,770
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 | 56,028 | 48,547
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 | 97,646 | 73,474
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 | 70,284 | 31,086
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 | 7,320 | 2,194
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 | 17,367 | 9,462
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 | $ 5,344 | $ 8,984

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