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Derivatives (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets $ 144,871 $ 68,065
Derivative liabilities 137,099 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 3,390 550
Derivative liabilities 4,825 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 3,276 528
Derivative liabilities 18 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 4,807 21
Derivatives 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 99  
Derivatives 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 assets 15  
Derivatives not designated as hedging instruments
   
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 141,481 67,515
Derivative liabilities 132,274 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 128,114 59,185
Derivative liabilities 90,522 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 3,489 3,231
Derivative liabilities 29,402 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 2,009 2,065
Derivative liabilities 84 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 2,793 40
Derivative liabilities 3,873 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 647 1,912
Derivative liabilities 319 413
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 4,347  
Derivative liabilities 7,684 124
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 34 1,082
Derivative liabilities 194 481
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 assets 48  
Derivative liabilities $ 196