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Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2015
Derivative Instruments [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The tables below present the fair value of our derivative instruments, as of March 31, 2015 and December 31, 2014. During the three months ended March 31, 2015 and March 31, 2014, we did not elect hedge treatment for these derivative positions. As a result, all changes in fair value are marked to market in the accompanying condensed consolidated statements of income.
(in thousands) |  |  | March 31, 2015 |  | December 31, 2014
Derivative Type | Balance Sheet Location |  | Assets |  | Liabilities |  | Assets |  | Liabilities
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |
Interest rate derivatives | Other current assets |  | $ | 5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest rate derivatives | Other long term assets |  | — |  |  | — |  |  | 24 |  |  | — |
Commodity derivatives (1) | Other current assets |  | — |  |  | (36 | ) |  | 456 |  |  | (61 | )
Total gross value of derivatives |  | 5 |  |  | (36 | ) |  | 480 |  |  | (61 | )
Less: Counterparty netting and cash collateral (2) |  | (156 | ) |  | (36 | ) |  | 61 |  |  | (61 | )
Total net fair value of derivatives |  | $ | 161 |  |  | $ | — |  |  | $ | 419 |  |  | $ | — |
(1) As of March 31, 2015, we had open derivative contracts representing 12,000 barrels of refined petroleum products. (2) As of March 31, 2015, $0.2 million of cash collateral associated with our commodity derivatives has been netted with the derivative positions with each counterparty.
Derivative Instruments, Gain (Loss) [Table Text Block] | Recognized gains (losses) associated with derivatives not designated as hedging instruments for the three months ended March 31, 2015 and 2014 were as follows (in thousands):
|  |  | Three Months Ended March 31,
Derivative Type | Income Statement Location |  | 2015 |  | 2014
Interest rate derivatives | Interest expense |  | $ | (19 | ) |  | $ | (21 | )
Commodity derivatives | Cost of goods sold |  | 339 |  |  | — |
| Total |  | $ | 320 |  |  | $ | (21 | )

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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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