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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Commodity contracts
    
Derivative instruments, at their respective fair value positions    
Total Net Assets $ 17,404 $ 19,654
Total Net Liabilities 12,684 16,140
Commodity contracts | Other current assets
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 15,764 18,277
Commodity contracts | Identifiable intangible and other non-current assets
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 1,640 1,377
Commodity contracts | Accrued expenses and other current liabilities
    
Derivative instruments, at their respective fair value positions    
Total Net Liabilities 11,662 15,152
Commodity contracts | Other long-term liabilities
    
Derivative instruments, at their respective fair value positions    
Total Net Liabilities 1,022 988
Foreign currency contracts
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 4,848 145
Total Net Liabilities 731 1,556
Foreign currency contracts | Other current assets
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 4,768 145
Foreign currency contracts | Identifiable intangible and other non-current assets
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 80  
Foreign currency contracts | Accrued expenses and other current liabilities
    
Derivative instruments, at their respective fair value positions    
Total Net Liabilities 731 1,458
Foreign currency contracts | Other long-term liabilities
    
Derivative instruments, at their respective fair value positions    
Total Net Liabilities   $ 98