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Derivative Instruments Balance Sheet Location (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Counterparty Netting and Cash Collateral, Assets $ (352,000) [1] $ 0 [1]
Counterparty Netting and Cash Collateral, Liabilities (45,000) [1] 0 [1]
Total net fair value of derivative, assets 565,000 116,000
Total net fair value of derivative, liabilities 0 0
Footnote [Abstract]    
Cash collateral 400,000 0
Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Assets 213,000 116,000
Liabilities (45,000) 0
Footnote [Abstract]    
Derivative open contracts (barrels) 125,000  
Not Designated as Hedging Instrument [Member] | Interest rate derivatives | Other long term assets
    
Derivatives, Fair Value [Line Items]    
Assets 45,000 116,000
Liabilities 0 0
Not Designated as Hedging Instrument [Member] | Commodity derivatives | Other current assets
    
Derivatives, Fair Value [Line Items]    
Assets 168,000 [2] 0 [2]
Liabilities $ (45,000) [2] $ 0 [2]
[1] As of September 30, 2014, $0.4 million of cash collateral associated with our commodity derivatives has been netted with the derivative positions with each counterparty.
[2] As of September 30, 2014, we had open derivative contracts representing 125,000 barrels of refined petroleum products.