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Retirement Plans (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Fair value of defined benefit plan assets, ending balance $ 175,952 $ 147,788
U.S. Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of defined benefit plan assets, beginning balance 106,572 91,610
Actual return on defined benefit plan assets 19,755 11,761
Company contributions 4,820 6,409
Benefits paid (2,631) (3,208)
Fair value of defined benefit plan assets, ending balance 128,516 106,572
U.S. Retiree Healthcare Plan
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of defined benefit plan assets, beginning balance 5,357 4,319
Actual return on defined benefit plan assets 693 516
Company contributions 290 275
Employee contributions 818 727
Benefits paid (542) (480)
Fair value of defined benefit plan assets, ending balance 6,616 5,357
Non-U.S. Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of defined benefit plan assets, beginning balance 35,859 12,798
Actual return on defined benefit plan assets 1,948 1,007
Company contributions 4,104 4,243
Employee contributions 612 566
Benefits paid (1,743) (1,011)
Other plans' impact on fair value of defined benefit plan assets   18,382
Foreign currency impact on plan assets 40 (126)
Fair value of defined benefit plan assets, ending balance $ 40,820 $ 35,859