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Derivative Instruments Balance Sheet Location (Details) $ in Thousands | Sep. 30, 2016 USD ($) bbl | Dec. 31, 2015 USD ($) bbl
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Footnote [Abstract] |  |  |
Cash collateral |  |  | $ 800
Derivatives not designated as hedging instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | $ 88 | 171
Liabilities |  | (279) | (45)
Counterparty Netting and Cash Collateral, Assets | [1] | 88 | (706)
Counterparty Netting and Cash Collateral, Liabilities | [1] | (88) | (45)
Total net fair value of derivative, assets |  | 0 | 877
Total net fair value of derivative, liabilities |  | $ (191) | $ 0
Footnote [Abstract] |  |  |
Derivative open contracts (barrels) | bbl |  | 100,000 | 171,000
Derivatives not designated as hedging instrument [Member] | Interest rate derivatives | Other long term assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | $ 0 | $ 0
Liabilities |  | 0 | 0
Derivatives not designated as hedging instrument [Member] | OTC commodity swaps | Other current assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets | [2] | 88 | 171
Liabilities | [2] | $ (279) | $ (45)
[1] | As of September 30, 2016, a nominal amount of cash collateral was held by counterparty brokerage firms and has been netted with the net derivative positions with each counterparty. As of December 31, 2015, $0.8 million of cash collateral was held by counterparty brokerage firms.
[2] | As of September 30, 2016 and December 31, 2015, we had open derivative contracts representing 100,000 barrels and 171,000 barrels, respectively, of refined petroleum products.

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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