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Derivatives (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets $ 90,853 $ 78,203
Derivative liabilities 79,117 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 2,232 1,139
Derivative liabilities 1,476 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   991
Derivative liabilities   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 2,181  
Derivative liabilities 1,476  
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 51 148
Derivatives not designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 88,621 77,064
Derivative liabilities 77,641 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 38,000 67,533
Derivative liabilities 3,368 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 1,566 1,423
Derivative liabilities 71 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 36,473 5,776
Derivative liabilities 62,646 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 302 46
Derivative liabilities 1,171 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 10,646 741
Derivative liabilities 7,210 595
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 55  
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 1,579 1,545
Derivative liabilities 3,175 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