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Retirement Plans (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Fair value of defined benefit plan assets $ 175,952 $ 147,788  
U.S. Pension Plans
     
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation (134,593) (145,047) (136,256)
Fair value of defined benefit plan assets 128,516 106,572 91,610
Funded status of defined benefit plan (6,077) (38,475)  
U.S. Retiree Healthcare Plan
     
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation (11,020) (10,788) (9,146)
Fair value of defined benefit plan assets 6,616 5,357 4,319
Funded status of defined benefit plan (4,404) (5,431)  
Non-U.S. Pension Plans
     
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation (69,116) (64,857) (29,195)
Fair value of defined benefit plan assets 40,820 35,859 12,798
Funded status of defined benefit plan $ (28,296) $ (28,998)