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Retirement Plans (Details 11) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance $ 202,981  
Fair value of defined benefit plan assets, ending balance 204,570 $ 202,981
Significant Unobservable Inputs (Level 3)    
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance 46,277 41,445
Net purchases (sales) and appreciation (depreciation) of defined benefit plan assets 1,689 4,832
Fair value of defined benefit plan assets, ending balance 47,966 46,277
U.S. Pension Plans    
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance 135,887 128,516
Fair value of defined benefit plan assets, ending balance 136,128 135,887
U.S. Pension Plans | Significant Unobservable Inputs (Level 3)    
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance 7,334  
Fair value of defined benefit plan assets, ending balance 7,395 7,334
U.S. Pension Plans | Hedge Funds [Member]    
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance [1] 7,334  
Fair value of defined benefit plan assets, ending balance [1] 7,395 7,334
U.S. Pension Plans | Hedge Funds [Member] | Significant Unobservable Inputs (Level 3)    
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance 7,334 [1] 7,025
Net purchases (sales) and appreciation (depreciation) of defined benefit plan assets 61 309
Fair value of defined benefit plan assets, ending balance [1] 7,395 7,334
Non-U.S. Pension Plans    
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance 59,568 40,820
Fair value of defined benefit plan assets, ending balance 60,441 59,568
Non-U.S. Pension Plans | Significant Unobservable Inputs (Level 3)    
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance 38,943  
Fair value of defined benefit plan assets, ending balance 40,571 38,943
Non-U.S. Pension Plans | Bank and Insurance Investment Contracts [Member]    
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance [2] 38,943  
Fair value of defined benefit plan assets, ending balance [2] 40,571 38,943
Non-U.S. Pension Plans | Bank and Insurance Investment Contracts [Member] | Significant Unobservable Inputs (Level 3)    
Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of defined benefit plan assets, beginning balance 38,943 [2] 34,420
Net purchases (sales) and appreciation (depreciation) of defined benefit plan assets 1,628 4,523
Fair value of defined benefit plan assets, ending balance [2] $ 40,571 $ 38,943
[1] Hedge funds invest in both short and long term U.S. common stocks. Management of the hedge funds has the ability to shift investments from value to growth strategies, from large to small capitalization stocks and from a net long position to a net short position.
[2] Amount represents bank and insurance guaranteed investment contracts.