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Derivative Instruments Balance Sheet Location (Details) $ in Thousands | Sep. 30, 2015 USD ($) bbl | Dec. 31, 2014 USD ($) bbl
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | $ 6 | $ 480
Liabilities |  | (9) | (61)
Counterparty Netting and Cash Collateral, Assets | [1] | 6 | 61
Counterparty Netting and Cash Collateral, Liabilities | [1] | 72 | (61)
Total net fair value of derivative, assets |  | 0 | 419
Total net fair value of derivative, liabilities |  | (81) | 0
Footnote [Abstract] |  |  |
Cash collateral |  |  | $ 0
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | $ 100 |
Not Designated as Hedging Instrument [Member] |  |  |
Footnote [Abstract] |  |  |
Derivative open contracts (barrels) | bbl |  | 3,000 | 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] | Commodity derivatives | Other current liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets | [2] | 6 | 456
Liabilities | [2] | $ (9) | $ (61)
[1] | As of September 30, 2015 we had negative cash collateral of $0.1 million netted with the derivatives of one of our counterparties. As of December 31, 2014, no cash collateral associated with our commodity derivatives has been netted with the derivative positions with each counterparty.
[2] | As of September 30, 2015 and December 31, 2014, we had open derivative contracts representing 3,000 barrels and 142,000 barrels, respectively, of refined petroleum products

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