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Derivatives (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets $ 83,950 $ 78,203
Derivative liabilities 73,656 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 6,383 1,139
Derivative liabilities 640 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 6,345 991
Derivative liabilities 572 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 liabilities 68  
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 38 148
Derivatives not designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 77,567 77,064
Derivative liabilities 73,016 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 59,536 67,533
Derivative liabilities 34,828 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 4,022 1,423
Derivative liabilities 2,222 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 4,385 5,776
Derivative liabilities 17,843 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 1,106 46
Derivative liabilities 1,568 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 4,564 741
Derivative liabilities 3,990 595
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 3,954 1,545
Derivative liabilities 12,477 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 $ 88 $ 99