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Segment Reporting - Financial Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | $ 65,433 | $ 65,940 | $ 167,237 | $ 171,916 |
Retail cost of revenues | 42,120 | 52,387 | 111,207 | 140,508 |
Optimization Revenues - Affiliates | (67) | 197 | 1,862 | 1,821 |
Current period settlements on derivatives |  |  | 8,547 | (10,256) |
Retail gross margin | 23,093 | 17,891 | 50,967 | 35,575 |
Total Assets | 108,540 | 86,458 | 108,540 | 86,458 | $ 138,397
Not Designated as Hedging Instrument |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (Loss) on derivatives, net | (4,041) | (4,438) | (5,241) | 7,010 |
Current period settlements on derivatives | 4,328 | (97) | 8,442 | (12,998) |
Operating Segments | Retail Electricity |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 44,072 | 42,771 | 88,521 | 86,219 |
Retail cost of revenues | 32,745 | 35,753 | 68,365 | 73,370 |
Optimization Revenues - Affiliates | 0 | 0 | 0 | 0 |
Retail gross margin | 13,662 | 10,773 | 23,222 | 17,749 |
Total Assets | 62,457 | 38,606 | 62,457 | 38,606 |
Operating Segments | Retail Electricity | Not Designated as Hedging Instrument |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (Loss) on derivatives, net | (4,692) | (4,297) | (5,324) | 5,596 |
Current period settlements on derivatives | 2,357 | 542 | 2,258 | (10,496) |
Operating Segments | Retail Natural Gas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 21,361 | 23,169 | 78,716 | 85,697 |
Retail cost of revenues | 9,375 | 16,634 | 42,842 | 67,138 |
Optimization Revenues - Affiliates | (67) | 197 | 1,862 | 1,821 |
Retail gross margin | 9,431 | 7,118 | 27,745 | 17,826 |
Total Assets | 93,852 | 79,570 | 93,852 | 79,570 |
Operating Segments | Retail Natural Gas | Not Designated as Hedging Instrument |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (Loss) on derivatives, net | 651 | (141) | 83 | 1,414 |
Current period settlements on derivatives | 1,971 | (639) | 6,184 | (2,502) |
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 | 33,724 | 1,623 | 33,724 | 1,623 |
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 | (81,493) | (33,341) | (81,493) | (33,341) |
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 |

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