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Derivatives (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets $ 250,341 $ 68,065
Derivative liabilities 254,621 57,920
Derivatives designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 794 550
Derivative liabilities 8,020 1,540
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 794 528
Derivative liabilities 834 1,519
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   22
Derivative liabilities 7,186 21
Derivatives not designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 249,547 67,515
Derivative liabilities 246,601 56,380
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 95,748 59,185
Derivative liabilities 12,659 37,713
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 142,035 3,231
Derivative liabilities 231,173 16,434
Derivatives not designated as hedging instruments | Commodity contracts | Non-current other assets
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 9,520 2,065
Derivative liabilities 214 2
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 29 40
Derivative liabilities 457 1,213
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 1,975 1,912
Derivative liabilities 1,463 413
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 75  
Derivative liabilities 463 124
Derivatives not designated as hedging instruments | Foreign currency contracts | Non-current other assets
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 165 1,082
Derivative liabilities   481
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 $ 172