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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair value, measurements, recurring
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Assets, fair value disclosure $ 40,827 $ 24,741
Liabilities, fair value disclosure (39,923) (24,720)
Fair value, measurements, recurring | Foreign Exchange Contract [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Assets, fair value disclosure 904  
Liabilities, fair value disclosure   (9)
Fair value, measurements, recurring | Non-qualified deferred compensation assets
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Assets, fair value disclosure 39,923 24,711
Fair value, measurements, recurring | Commodity contracts
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Assets, fair value disclosure   30
Fair value, measurements, recurring | Non-qualified deferred compensation liabilities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Liabilities, fair value disclosure (39,923) (24,711)
Level 1 | Fair value, measurements, recurring
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Assets, fair value disclosure 39,923 24,711
Liabilities, fair value disclosure (39,923) (24,711)
Level 1 | Fair value, measurements, recurring | Non-qualified deferred compensation liabilities
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Liabilities, fair value disclosure (39,923) (24,711)
Level 2 | Fair value, measurements, recurring
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Assets, fair value disclosure 904 30
Liabilities, fair value disclosure 0 (9)
Level 2 | Fair value, measurements, recurring | Foreign Exchange Contract [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Assets, fair value disclosure 904  
Liabilities, fair value disclosure   (9)
Level 2 | Fair value, measurements, recurring | Commodity contracts
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Assets, fair value disclosure   30
Supplemental Employee Retirement Plans, Defined Benefit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent $ 39,923 $ 24,711