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Derivatives (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets $ 80,701 $ 59,940
Derivative liabilities 64,209 57,818
Derivatives designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 4,997 735
Derivative liabilities 3,610 1,544
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 4,997 735
Derivative liabilities 3,582 1,544
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 28  
Derivatives not designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative assets 75,704 59,205
Derivative liabilities 60,599 56,274
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 65,739 47,062
Derivative liabilities 37,292 26,876
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 3,242 1,642
Derivative liabilities 1,427 894
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 1,257 1,141
Derivative liabilities 10,807 15,473
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 307 874
Derivative liabilities 1,184 1,228
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 1,215 5,003
Derivative liabilities 700 2,867
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 3,944 3,483
Derivative liabilities 8,982 8,789
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 $ 207 $ 147