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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