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Pension and Postretirement Benefits - Fair Value of the Plans' Assets by Asset Class (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Domestic Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | $ 11,878 | $ 11,291
Domestic Plans | Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 6,430 | 5,267
Domestic Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,485 | 5,518
Domestic Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 774 | 316
Domestic Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 189 | 190
Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 10,798 | 10,013
Foreign Pension Plans | Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,450 | 5,194
Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,153 | 4,669
Foreign Pension Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 195 | 150
Quoted Prices in Active Markets (Level 1) | Domestic Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 11,689 | 11,101
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 6,430 | 5,267
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,485 | 5,518
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 774 | 316
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 10,798 | 10,013
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,450 | 5,194
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,153 | 4,669
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 195 | 150
Significant Other Observable Inputs (Level 2) | Domestic Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 189 | 190
Significant Other Observable Inputs (Level 2) | Domestic Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | $ 189 | $ 190

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