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Retirement Plans (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Long-term portion of retirement benefits $ (74,723) $ (101,225)
U.S. Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Current defined benefit plan liabilities 0 (140)
Long-term portion of retirement benefits (6,077) (38,335)
Net amount of defined benefit plan recognized in balance sheet (6,077) (38,475)
U.S. Retiree Healthcare Plan
    
Defined Benefit Plan Disclosure [Line Items]    
Current defined benefit plan liabilities (262) (283)
Long-term portion of retirement benefits (4,142) (5,148)
Net amount of defined benefit plan recognized in balance sheet (4,404) (5,431)
Non-U.S. Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Long-term defined benefit plan assets 1,370 1,407
Current defined benefit plan liabilities (193) (175)
Long-term portion of retirement benefits (29,473) (30,230)
Net amount of defined benefit plan recognized in balance sheet $ (28,296) $ (28,998)