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Derivative Instruments Balance Sheet Location (Details)
$ in Thousands
Jun. 30, 2015
USD ($)
bbl
Dec. 31, 2014
USD ($)
bbl
Derivatives, Fair Value [Line Items]    
Assets $ 12 $ 480
Liabilities (25) (61)
Counterparty Netting and Cash Collateral, Assets [1] 11 61
Counterparty Netting and Cash Collateral, Liabilities [1] (11) (61)
Total net fair value of derivative, assets 1 419
Total net fair value of derivative, liabilities (14) 0
Footnote [Abstract]    
Cash collateral $ 0 $ 0
Not Designated as Hedging Instrument [Member]    
Footnote [Abstract]    
Derivative open contracts (barrels) | bbl 48,000 142,000
Not Designated as Hedging Instrument [Member] | Interest rate derivatives | Other long term assets    
Derivatives, Fair Value [Line Items]    
Assets $ 0 $ 24
Liabilities 0 0
Not Designated as Hedging Instrument [Member] | Interest rate derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Assets 1 0
Liabilities 0 0
Not Designated as Hedging Instrument [Member] | Commodity derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Assets [2] 11 456
Liabilities [2] $ (25) $ (61)
[1] As of June 30, 2015 and December 31, 2014, no cash collateral associated with our commodity derivatives has been netted with the derivative positions with each counterparty.
[2] As of June 30, 2015 and December 31, 2014, we had open derivative contracts representing 48,000 barrels and 142,000 barrels, respectively, of refined petroleum products