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Retirement Plans (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
U.S. Pension Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, beginning balance $ 145,047 $ 136,256  
Service cost, including contributions by plan participants 0 9  
Interest cost 5,505 5,806 6,166
Actuarial (gains) losses (13,328) 6,184  
Benefits paid (2,631) (3,208)  
Projected benefit obligation, ending balance 134,593 145,047 136,256
U.S. Retiree Healthcare Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, beginning balance 10,788 9,146  
Service cost, including contributions by plan participants 1,733 1,447  
Interest cost 333 350 364
Actuarial (gains) losses (1,292) 325  
Benefits paid (542) (480)  
Projected benefit obligation, ending balance 11,020 10,788 9,146
Non-U.S. Pension Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, beginning balance 64,857 29,195  
Service cost, including contributions by plan participants 5,079 4,318  
Interest cost 1,966 1,988 1,079
Actuarial (gains) losses (925) 5,790  
Benefits paid (1,743) (1,011)  
Plan amendments impact on projected benefit obligation 232    
Other plans' impact on projected benefit obligation 227 25,041  
Foreign currency impact on projected benefit obligation (577) (464)  
Projected benefit obligation, ending balance $ 69,116 $ 64,857 $ 29,195