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Derivatives (Details 2) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative asset $ 187,767,000 $ 59,940,000
Derivative liability 143,046,000 57,818,000
Derivative, credit-risk related contingent features    
Net liability position 23,600,000  
Collateral posted 2,200,000  
Additional assets required to be posted should credit-risk contingent feature be triggered 21,400,000  
Derivatives designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative asset 14,377,000 735,000
Derivative liability 995,000 1,544,000
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 asset 11,207,000 735,000
Derivative liability 501,000 1,544,000
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 asset 3,170,000  
Derivative liability 494,000  
Derivatives not designated as hedging instruments
    
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet    
Derivative asset 173,390,000 59,205,000
Derivative liability 142,051,000 56,274,000
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 asset 90,585,000 47,062,000
Derivative liability 19,213,000 26,876,000
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 asset 9,837,000 1,642,000
Derivative liability 472,000 894,000
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 asset 46,130,000 1,141,000
Derivative liability 97,135,000 15,473,000
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 asset 6,981,000 874,000
Derivative liability 14,865,000 1,228,000
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 asset 16,912,000 5,003,000
Derivative liability 6,035,000 2,867,000
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 asset 469,000  
Derivative liability 7,000  
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 asset 2,476,000 3,483,000
Derivative liability 4,324,000 8,789,000
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 liability   $ 147,000