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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |
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, 2015 and 2014. 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 may differ from the amounts presented in our consolidated balance sheets. During the years ended December 31, 2015 and 2014, 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, 2015 |  | December 31, 2014
Derivative Type | Balance Sheet Location |  | Assets |  | Liabilities |  | Assets |  | Liabilities
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |
Interest rate derivatives | Other long term assets |  | $ | — |  |  | $ | — |  |  | $ | 24 |  |  | $ | — |
OTC commodity swaps (1) | Other current assets |  | 171 |  |  | (45 | ) |  | 456 |  |  | (61 | )
Total gross value of derivatives |  | $ | 171 |  |  | $ | (45 | ) |  | $ | 480 |  |  | $ | (61 | )
Less: Counterparty netting and cash collateral (2) |  |  | (706 | ) |  | (45 | ) |  | 61 |  |  | (61 | )
Total net fair value of derivatives |  |  | $ | 877 |  |  | $ | — |  |  | $ | 419 |  |  | $ | — |
(1) | As of December 31, 2015, we had open derivative contracts representing 171,000 barrels of refined petroleum products. As of December 31, 2014, we had 142,000 open derivative contracts.
(2) | As of December 31, 2015, $0.8 million 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, 2014, no cash collateral was held by counterparty brokerage firms.
Derivative Instruments, Gain (Loss) [Table Text Block] | ains (losses) associated with derivatives not designated as hedging instruments for the years ended December 31, 2015 and 2014 were as follows (in thousands):
|  |  | Year Ended December 31,
Derivative Type | Income Statement Location |  | 2015 |  | 2014 |  | 2013
Interest rate derivatives | Interest expense |  | $ | (24 | ) |  | $ | (92 | ) |  | $ | (106 | )
OTC commodity swaps | Cost of goods sold |  | 441 |  |  | 3,083 |  |  | (614 | )
| Total |  | $ | 417 |  |  | $ | 2,991 |  |  | $ | (720 | )

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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 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: 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=56946850&loc=SL5618551-113959 + 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=56946850&loc=SL5624163-113959 + Details
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