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Pensions (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
U.S. Plans
   
Projected Benefit Obligation Exceeds the Fair Value of Plan's Assets    
Projected benefit obligation $ 53,699 $ 116,620
Accumulated benefit obligation 50,188 111,625
Fair value of plan assets 48,704 88,184
Accumulated Benefit Obligation Exceeds the Fair Value of Plan's Asset    
Projected benefit obligation 53,699 116,620
Accumulated benefit obligation 50,188 111,625
Fair value of plan assets 48,704 88,184
Employer contributions    
2014 1,526  
Benefit Payments    
2014 5,869  
2015 6,929  
2016 6,960  
2017 6,261  
2018 6,770  
2019 - 2023 36,676  
European Plans
   
Projected Benefit Obligation Exceeds the Fair Value of Plan's Assets    
Projected benefit obligation 31,485 33,022
Accumulated benefit obligation 29,568 31,123
Fair value of plan assets 18,101 17,769
Accumulated Benefit Obligation Exceeds the Fair Value of Plan's Asset    
Projected benefit obligation 31,485 33,022
Accumulated benefit obligation 29,568 31,123
Fair value of plan assets 18,101 17,769
Employer contributions    
2014 2,126  
Benefit Payments    
2014 3,297  
2015 1,602  
2016 1,231  
2017 1,527  
2018 1,443  
2019 - 2023 $ 8,393