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Pension and Postretirement Benefits - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Domestic Plans | Funded Plans    
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation $ 14,235 $ 15,440
Accumulated benefit obligation 14,235 15,440
Fair value of plan assets 10,299 11,590
Domestic Plans | Unfunded Pension Plans    
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 9,271 9,857
Accumulated benefit obligation 9,224 9,826
Foreign Pension Plans | Funded Plans    
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 8,134 9,521
Accumulated benefit obligation 7,581 8,819
Fair value of plan assets 8,243 9,493
Foreign Pension Plans | Unfunded Pension Plans    
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 2,290 2,582
Accumulated benefit obligation $ 2,290 $ 2,582