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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

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