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Pension and Postretirement Benefits - Summary of funded status of the plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Funded Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 16,012 $ 13,435  
Service cost 0 0  
Interest cost 616 644  
Recognized net actuarial loss (1,013) 2,700  
Plan amendments 0 0  
Benefits paid (709) (767)  
Benefit obligation at end of year 14,906 16,012 $ 13,435
Change in plan assets:      
Fair value of plan assets at beginning of year 11,198 10,872  
Actual return on plan assets (742) 364  
Company contributions 732 729  
Benefits paid (709) (767)  
Fair value of plan assets at end of year 10,479 11,198 10,872
Funded status at end of year (4,427) (4,814)  
Unfunded Pension Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 11,127 10,536  
Service cost 101 87  
Interest cost 402 435  
Recognized net actuarial loss (1,072) 649  
Plan amendments 0 0  
Benefits paid (509) (580)  
Benefit obligation at end of year 10,049 11,127 10,536
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Company contributions 509 580  
Benefits paid (509) (580)  
Fair value of plan assets at end of year 0 0 0
Funded status at end of year (10,049) (11,127)  
Postretirement Benefit Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 16,235 16,919  
Service cost 152 129  
Interest cost 619 640  
Recognized net actuarial loss (1,248) 1,011  
Plan amendments 3 (1,283)  
Benefits paid (1,188) (1,181)  
Benefit obligation at end of year 14,573 16,235 16,919
Change in plan assets:      
Fair value of plan assets at beginning of year 0 520  
Actual return on plan assets   (34)  
Company contributions 1,188 695  
Benefits paid (1,188) (1,181)  
Fair value of plan assets at end of year 0 0 520
Funded status at end of year (14,573) (16,235)  
Foreign Pension Plans      
Change in benefit obligation:      
Service cost 503 413 534
Interest cost 505 631 702
Recognized net actuarial loss 160 145 248
Change in plan assets:      
Fair value of plan assets at beginning of year 11,747    
Fair value of plan assets at end of year 9,705 11,747  
Foreign Pension Plans | Funded Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 9,744 12,016 11,460
Service cost 503 413  
Interest cost 415 507  
Recognized net actuarial loss (176) 1,042  
Benefits paid (1,115) (344)  
Benefit obligation at end of year   9,744 12,016
Translation adjustment (1,899) (1,062)  
Change in plan assets:      
Fair value of plan assets at beginning of year 9,705 11,747 11,560
Actual return on plan assets 377 983  
Company contributions 566 604  
Benefits paid (1,115) (344)  
Fair value of plan assets at end of year   9,705 11,747
Translation adjustment (1,870) (1,056)  
Funded status at end of year   (39) (269)
Foreign Pension Plans | Unfunded Pension Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 2,470 2,756 2,911
Service cost 0 0  
Interest cost 89 124  
Recognized net actuarial loss 178 234  
Benefits paid (179) (211)  
Benefit obligation at end of year   2,470 2,756
Translation adjustment (374) (302)  
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0 0
Actual return on plan assets   0  
Company contributions 179 211  
Benefits paid $ (179) (211)  
Fair value of plan assets at end of year   0 0
Translation adjustment   0  
Funded status at end of year   $ (2,470) $ (2,756)