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Pension and Postretirement Benefits - Fair Value of the Plans' Assets by Asset Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Domestic Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans $ 10,299 $ 11,590
Domestic Plans | Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 5,355 5,787
Domestic Plans | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 4,611 5,390
Domestic Plans | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 140 214
Domestic Plans | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 193 199
Foreign Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 8,243 9,493
Foreign Pension Plans | Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 3,967 4,414
Foreign Pension Plans | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 4,087 4,889
Foreign Pension Plans | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 189 190
Quoted Prices in Active Markets (Level 1) | Domestic Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 10,106 11,391
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 5,355 5,787
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 4,611 5,390
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 140 214
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 8,243 9,070
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 3,967 4,414
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 4,087 4,466
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 189 190
Significant Other Observable Inputs (Level 2) | Domestic Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans 193 199
Significant Other Observable Inputs (Level 2) | Domestic Plans | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans $ 193 199
Significant Other Observable Inputs (Level 2) | Foreign Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans   423
Significant Other Observable Inputs (Level 2) | Foreign Pension Plans | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value measurement domestic pension plans   $ 423