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Pension and Postretirement Benefits - Summary of Funded Status of the Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Domestic Plans      
Change in plan assets:      
Fair value of plan assets at beginning of year $ 10,299    
Fair value of plan assets at end of year 11,291 $ 10,299  
Foreign Pension Plans      
Change in benefit obligation:      
Service cost 405 552 $ 530
Interest cost 397 381 492
Actuarial adjustments 605 (238) (106)
Change in plan assets:      
Fair value of plan assets at beginning of year 8,243    
Fair value of plan assets at end of year 10,013 8,243  
Foreign Pension Plans | Funded Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 8,134 9,521  
Service cost 405 552  
Interest cost 320 308  
Actuarial adjustments 1,037 (809)  
Benefits paid (336) (732)  
Translation adjustment 430 (706)  
Benefit obligation at end of year 9,990 8,134 9,521
Change in plan assets:      
Fair value of plan assets at beginning of year 8,243 9,493  
Actual return on plan assets 1,156 (322)  
Company contributions 515 514  
Benefits paid (336) (732)  
Translation adjustment 435 (710)  
Fair value of plan assets at end of year 10,013 8,243 9,493
Funded status at end of year 23 109  
Foreign Pension Plans | Unfunded Pension Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 2,290 2,582  
Interest cost 77 73  
Actuarial adjustments 106 (25)  
Benefits paid (178) (184)  
Translation adjustment 36 (156)  
Benefit obligation at end of year 2,331 2,290 2,582
Change in plan assets:      
Company contributions 178 184  
Benefits paid (178) (184)  
Funded status at end of year (2,331) (2,290)  
Pension Plans | Domestic Plans      
Change in benefit obligation:      
Service cost 61 64 64
Interest cost 861 780 803
Actuarial adjustments 1,305 (76) 114
Pension Plans | Domestic Plans | Funded Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 14,235 15,440  
Interest cost 527 481  
Actuarial adjustments 1,611 (887)  
Benefits paid (801) (799)  
Benefit obligation at end of year 15,572 14,235 15,440
Change in plan assets:      
Fair value of plan assets at beginning of year 10,299 11,590  
Actual return on plan assets 1,157 (1,043)  
Company contributions 636 551  
Benefits paid (801) (799)  
Fair value of plan assets at end of year 11,291 10,299 11,590
Funded status at end of year (4,281) (3,936)  
Pension Plans | Domestic Plans | Unfunded Pension Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 9,271 9,857  
Service cost 61 64  
Interest cost 333 299  
Actuarial adjustments 753 (425)  
Benefits paid (956) (524)  
Benefit obligation at end of year 9,462 9,271 9,857
Change in plan assets:      
Company contributions 956 524  
Benefits paid (956) (524)  
Funded status at end of year (9,462) (9,271)  
Postretirement Benefit Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 13,454 13,807  
Service cost 64 80  
Interest cost 458 449  
Actuarial adjustments (1,117) 170  
Benefits paid (873) (1,052)  
Benefit obligation at end of year 11,986 13,454 13,807
Change in plan assets:      
Company contributions 873 1,052  
Benefits paid (873) (1,052)  
Funded status at end of year (11,986) (13,454)  
Postretirement Benefit Plans | Domestic Plans      
Change in benefit obligation:      
Service cost 64 80 92
Interest cost 458 449 413
Actuarial adjustments $ (1,117) $ 170 $ 237