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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Commodity contracts
    
Derivative instruments, at their respective fair value positions    
Total Net Assets $ 35,527 $ 19,654
Total Net Liabilities 15,647 16,140
Commodity contracts | Other current assets
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 34,032 18,277
Commodity contracts | Identifiable intangible and other non-current assets
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 1,495 1,377
Commodity contracts | Accrued expenses and other current liabilities
    
Derivative instruments, at their respective fair value positions    
Total Net Liabilities 14,778 15,152
Commodity contracts | Other long-term liabilities
    
Derivative instruments, at their respective fair value positions    
Total Net Liabilities 869 988
Foreign currency contracts
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 3,541 145
Total Net Liabilities 1,595 1,556
Foreign currency contracts | Other current assets
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 3,486 145
Foreign currency contracts | Identifiable intangible and other non-current assets
    
Derivative instruments, at their respective fair value positions    
Total Net Assets 55  
Foreign currency contracts | Accrued expenses and other current liabilities
    
Derivative instruments, at their respective fair value positions    
Total Net Liabilities 1,595 1,458
Foreign currency contracts | Other long-term liabilities
    
Derivative instruments, at their respective fair value positions    
Total Net Liabilities   $ 98