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Pension and Postretirement Benefits - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Domestic Plans | Funded Plans    
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation $ 15,572 $ 14,235
Accumulated benefit obligation 15,572 14,235
Fair value of plan assets 11,291 10,299
Domestic Plans | Unfunded Pension Plans    
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 9,462 9,271
Accumulated benefit obligation 9,454 9,224
Foreign Pension Plans | Funded Plans    
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 9,990 8,134
Accumulated benefit obligation 9,347 7,581
Fair value of plan assets 10,013 8,243
Foreign Pension Plans | Unfunded Pension Plans    
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 2,331 2,290
Accumulated benefit obligation $ 2,331 $ 2,290