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Derivatives (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets $ 102,130 $ 78,203
Derivative liabilities 89,178 69,547
Derivatives designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 2,164 1,139
Derivative liabilities 2,264 2,284
Derivatives designated as hedging instruments | Commodity contracts | Other current assets
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 39 991
Derivative liabilities 14 2,284
Derivatives designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 2,067  
Derivative liabilities 2,250  
Derivatives designated as hedging instruments | Foreign currency contracts | Other current assets
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 58 148
Derivatives not designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 99,966 77,064
Derivative liabilities 86,914 67,263
Derivatives not designated as hedging instruments | Commodity contracts | Other current assets
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 34,577 67,533
Derivative liabilities 10,406 41,410
Derivatives not designated as hedging instruments | Commodity contracts | Identifiable intangible and other non-current assets
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 1,906 1,423
Derivative liabilities 265 47
Derivatives not designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 46,744 5,776
Derivative liabilities 62,541 20,927
Derivatives not designated as hedging instruments | Commodity contracts | Other long-term liabilities
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets   46
Derivative liabilities 1,022 1,034
Derivatives not designated as hedging instruments | Foreign currency contracts | Other current assets
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 14,105 741
Derivative liabilities 9,395 595
Derivatives not designated as hedging instruments | Foreign currency contracts | Identifiable intangible and other non-current assets
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 104  
Derivative liabilities 24  
Derivatives not designated as hedging instruments | Foreign currency contracts | Accrued expenses and other current liabilities
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 2,530 1,545
Derivative liabilities 3,261 3,151
Derivatives not designated as hedging instruments | Foreign currency contracts | Other long-term liabilities
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative liabilities   $ 99