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Retirement Plans (Details 7) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
U.S. Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial (loss) gain on defined benefit plan recognized in accumulated other comprehensive income $ (27,999) $ (56,479)
Total recognized in accumulated other comprehensive income (loss) (27,999) (56,479)
Net actuarial (loss) gain on defined benefit plan to be amortized from accumulated other comprehensive income in the next fiscal year (1,941)  
Defined benefit plan amounts that will be amortized from accumulated other comprehensive income (loss) in the next fiscal year (1,941)  
U.S. Retiree Healthcare Plan
    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial (loss) gain on defined benefit plan recognized in accumulated other comprehensive income 1,233 (395)
Prior service credit from defined benefit plan recognized in accumulated other comprehensive income 52 105
Total recognized in accumulated other comprehensive income (loss) 1,285 (290)
Net actuarial (loss) gain on defined benefit plan to be amortized from accumulated other comprehensive income in the next fiscal year 16  
Prior service credit from defined benefit plan to be amortized from accumulated other comprehensive income in the next fiscal year 52  
Defined benefit plan amounts that will be amortized from accumulated other comprehensive income (loss) in the next fiscal year 68  
Non-U.S. Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial (loss) gain on defined benefit plan recognized in accumulated other comprehensive income (11,190) (13,674)
Prior service credit from defined benefit plan recognized in accumulated other comprehensive income 1,933 2,938
Total recognized in accumulated other comprehensive income (loss) (9,257) (10,736)
Net actuarial (loss) gain on defined benefit plan to be amortized from accumulated other comprehensive income in the next fiscal year (373)  
Prior service credit from defined benefit plan to be amortized from accumulated other comprehensive income in the next fiscal year 187  
Defined benefit plan amounts that will be amortized from accumulated other comprehensive income (loss) in the next fiscal year $ (186)