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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |
Derivative Instruments, Gain (Loss) [Table Text Block] | ains (losses) associated with derivatives not designated as hedging instruments for the years ended December 31, 2014 and 2013 were as follows (in thousands):
|  |  | Year Ended December 31,
Derivative Type | Income Statement Location |  | 2014 |  | 2013 |  | 2012
Interest rate derivatives | Interest expense |  | $ | (92 | ) |  | $ | (106 | ) |  | $ | — |
Commodity derivatives | Cost of goods sold |  | 3,083 |  |  | (614 | ) |  | 85 |
| Total |  | $ | 2,991 |  |  | $ | (720 | ) |  | $ | 85 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The following table presents the fair value of our derivative instruments, as of December 31, 2014 and 2013. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under our master netting arrangements, including any cash collateral on deposit with our counterparties. We have elected to offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements. As a result, the asset and liability amounts below differ from the amounts presented in our consolidated balance sheets. During the years ended December 31, 2014 and 2013, we did not elect hedge accounting treatment for these derivative positions. As a result, all changes in fair value are marked to market in the accompanying consolidated statements of income and comprehensive income.
|  |  | December 31, 2014 |  | December 31, 2013
Derivative Type | Balance Sheet Location |  | Assets |  | Liabilities |  | Assets |  | Liabilities
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |
Interest rate derivatives | Other long term assets |  | $ | 24 |  |  | $ | — |  |  | $ | 116 |  |  | $ | — |
Commodity derivatives (1) | Other current assets |  | 456 |  |  | (61 | ) |  | — |  |  | — |
Total gross value of derivatives |  | $ | 480 |  |  | $ | (61 | ) |  | $ | 116 |  |  | $ | — |
Less: Counterparty netting and cash collateral (2) |  |  | (61 | ) |  | 61 |  |  | — |  |  | — |
Total net fair value of derivatives |  |  | $ | 419 |  |  | $ | — |  |  | $ | 116 |  |  | $ | — |
(1) | As of December 31, 2014, we had open derivative contracts representing 142,000 barrels of refined petroleum products. As of December 31, 2013, we had no open derivative contracts.
(2) | As of December 31, 2014 and December 31, 2013, no cash collateral associated with our commodity derivatives has been netted with the derivative positions with each counterparty.

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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