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Pension and Other Postretirement Benefits - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | $ 355,726 | $ 311,509
U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 131,563 | 96,417
Non-U.S. equities fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 54,496 | 47,274
Government bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 74,219 | 66,439
Corporate bond fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 40,940 | 39,366
Fixed income fund |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 35,895 | 41,167
Other investments |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 9,462 | 17,274
Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 9,151 | 3,572
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 | 8,909 | 7,356
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 | 2,793 | 1,465
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 | 5,949 | 5,755
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 | 167 | 136
Significant Observable Inputs (Level 2) |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 44,300 | 47,709
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 | 745 | 1,253
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 | 9,854 | 7,116
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 | 33,701 | 39,340
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
Significant Unobservable Inputs (Level 3) |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
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 | 0 | 0
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 | 0 | 0
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 | 0 | 0
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 | 0 | 0
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 | 0 | 0
Significant Unobservable Inputs (Level 3) | Other investments |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 0 | 0
Significant Unobservable Inputs (Level 3) | Cash & equivalents |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | $ 0 | $ 0

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