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Pension and Postretirement Benefits - Fair Value of the Plans' Assets by Asset Class (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Domestic Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | $ 11,291 | $ 10,299
Domestic Plans | Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,267 | 5,355
Domestic Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,518 | 4,611
Domestic Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 316 | 140
Domestic Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 190 | 193
Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 10,013 | 8,243
Foreign Pension Plans | Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,194 | 3,967
Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,669 | 4,087
Foreign Pension Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 150 | 189
Quoted Prices in Active Markets (Level 1) | Domestic Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 11,101 | 10,106
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,267 | 5,355
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,518 | 4,611
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 316 | 140
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 10,013 | 8,243
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 | 5,194 | 3,967
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,669 | 4,087
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 150 | 189
Significant Other Observable Inputs (Level 2) | Domestic Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 190 | 193
Significant Other Observable Inputs (Level 2) | Domestic Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | $ 190 | $ 193

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