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Fair Value Measurements (Details 2) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Fair value measurement, additional disclosure    
Cash collateral deposits held by financial counterparties $ 43,900,000 $ 13,000,000
Cash collateral deposits held by financial counterparties, offset against liabilities 34,700,000  
Cash collateral deposits held by financial counterparties, not offset 9,200,000  
Cash collateral received from customers 2,900,000 4,700,000
Commodity contracts
    
Derivative instruments, at their respective fair value positions    
Total net assets 88,578,000 15,471,000
Total net liabilities 21,545,000 14,686,000
Commodity contracts | Other current assets
    
Derivative instruments, at their respective fair value positions    
Total net assets 79,213,000 14,723,000
Commodity contracts | Identifiable intangible and other non-current assets
    
Derivative instruments, at their respective fair value positions    
Total net assets 9,365,000 748,000
Commodity contracts | Accrued expenses and other current liabilities
    
Derivative instruments, at their respective fair value positions    
Total net liabilities 13,661,000 14,332,000
Commodity contracts | Other long-term liabilities
    
Derivative instruments, at their respective fair value positions    
Total net liabilities 7,884,000 354,000
Foreign currency contracts
    
Derivative instruments, at their respective fair value positions    
Total net assets 11,339,000 2,136,000
Total net liabilities 1,848,000 5,453,000
Foreign currency contracts | Other current assets
    
Derivative instruments, at their respective fair value positions    
Total net assets 10,877,000 2,136,000
Foreign currency contracts | Identifiable intangible and other non-current assets
    
Derivative instruments, at their respective fair value positions    
Total net assets 462,000  
Foreign currency contracts | Accrued expenses and other current liabilities
    
Derivative instruments, at their respective fair value positions    
Total net liabilities 1,848,000 5,306,000
Foreign currency contracts | Other long-term liabilities
    
Derivative instruments, at their respective fair value positions    
Total net liabilities   $ 147,000