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Segment Reporting - Financial Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Revenues | $ 91,267 | $ 68,217 | $ 263,313 | [1] | $ 240,134 |
Retail cost of revenues | 60,967 | 51,863 | 176,000 | [1] | 192,371 |
Optimization Revenues - Affiliates | (545) | (141) | 1,317 | [1] | 1,681 |
Current period settlements on derivatives |  |  | 15,120 | [1] | (7,252) |
Retail gross margin | 26,678 | 14,619 | 79,229 |  | 50,194 |
Total Assets | 160,453 | 122,074 | 160,453 |  | 122,074 | $ 138,397
Not Designated as Hedging Instrument |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (Loss) on derivatives, net | 132 | (1,163) | (5,876) |  | 5,847 |
Current period settlements on derivatives | 4,035 | 3,039 | 12,643 |  | (9,959) |
Operating Segments | Retail Electricity |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Revenues | 76,913 | 51,748 | 170,060 |  | 137,968 |
Retail cost of revenues | 50,787 | 41,628 | 122,864 |  | 114,997 |
Optimization Revenues - Affiliates | 0 | 0 | 0 |  | 0 |
Retail gross margin | 18,925 | 6,769 | 43,670 |  | 24,519 |
Total Assets | 147,037 | 47,677 | 147,037 |  | 47,677 |
Operating Segments | Retail Electricity | Not Designated as Hedging Instrument |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (Loss) on derivatives, net | 3,891 | 445 | (2,201) |  | 6,037 |
Current period settlements on derivatives | 3,310 | 2,906 | 5,727 |  | (7,585) |
Operating Segments | Retail Natural Gas |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Revenues | 14,354 | 16,469 | 93,253 |  | 102,166 |
Retail cost of revenues | 10,180 | 10,235 | 53,136 |  | 77,374 |
Optimization Revenues - Affiliates | (545) | (141) | 1,317 |  | 1,681 |
Retail gross margin | 7,753 | 7,850 | 35,559 |  | 25,675 |
Total Assets | 101,844 | 92,974 | 101,844 |  | 92,974 |
Operating Segments | Retail Natural Gas | Not Designated as Hedging Instrument |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (Loss) on derivatives, net | (3,759) | (1,608) | (3,675) |  | (190) |
Current period settlements on derivatives | 725 | 133 | 6,916 |  | (2,374) |
Corporate, Non-Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Revenues | 0 | 0 | 0 |  | 0 |
Retail cost of revenues | 0 | 0 | 0 |  | 0 |
Optimization Revenues - Affiliates | 0 | 0 | 0 |  | 0 |
Retail gross margin | 0 | 0 | 0 |  | 0 |
Total Assets | 96,319 | 20,309 | 96,319 |  | 20,309 |
Corporate, Non-Segment | Not Designated as Hedging Instrument |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (Loss) on derivatives, net | 0 | 0 | 0 |  | 0 |
Current period settlements on derivatives | 0 | 0 | 0 |  | 0 |
Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Revenues | 0 | 0 | 0 |  | 0 |
Retail cost of revenues | 0 | 0 | 0 |  | 0 |
Optimization Revenues - Affiliates | 0 | 0 | 0 |  | 0 |
Retail gross margin | 0 | 0 | 0 |  | 0 |
Total Assets | (184,747) | (38,886) | (184,747) |  | (38,886) |
Eliminations | Not Designated as Hedging Instrument |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (Loss) on derivatives, net | 0 | 0 | 0 |  | 0 |
Current period settlements on derivatives | $ 0 | $ 0 | $ 0 |  | $ 0 |
[1] | Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC on May 12, 2015 from an affiliate. See Note 2 “Basis of Presentation” and Note 3 "Acquisitions" for further discussion.

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