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Retirement Plans (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
U.S. Pension Plans      
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning balance $ 155,693 $ 134,593  
Interest cost 6,128 6,417 $ 5,505
Actuarial (gains) losses (3,266) 18,270  
Benefits paid (3,552) (3,587)  
Projected benefit obligation, ending balance 155,003 155,693 134,593
U.S. Retiree Healthcare Plan      
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning balance 13,512 11,020  
Service cost 577 791 915
Employee contributions 864 832  
Interest cost 470 463 333
Actuarial (gains) losses (1,552) 1,253  
Benefits paid (908) (847)  
Projected benefit obligation, ending balance 12,963 13,512 11,020
Non-U.S. Pension Plans      
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning balance 82,006 69,116  
Service cost 5,087 4,579 4,467
Employee contributions 573 592  
Interest cost 1,503 2,195 1,966
Actuarial (gains) losses (3,956) 17,967  
Benefits paid (2,503) (1,195)  
Plan amendments impact on projected benefit obligation (645) 796  
Plan obligation settlement (577) (2,766)  
Foreign currency impact on projected benefit obligation (5,811) (9,278)  
Projected benefit obligation, ending balance $ 75,677 $ 82,006 $ 69,116