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Segment Reporting - Financial Data (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues |  | $ 194,345 | $ 110,546 |
Retail cost of revenues | [1] | 143,698 | 68,800 |
Less: |  |  |  |
Net asset optimization (expense)/revenues | [2] | (194) | 527 |
(Losses) gains on non-trading derivatives |  | (21,456) | (9,749) |
Current period settlements on non-trading derivatives |  | 7,414 | 11,272 |
Retail Gross Margin |  | 64,304 | 39,562 |
Total Assets |  | 365,817 |  | $ 376,168
Goodwill |  | 79,407 |  | 79,147
Non-trading |  |  |  |
Less: |  |  |  |
(Losses) gains on non-trading derivatives |  | (21,037) | (9,620) |
Current period settlements on non-trading derivatives |  | 7,574 | 11,277 |
Operating Segments | Retail Electricity |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues |  | 131,733 | 61,933 |
Retail cost of revenues |  | 106,780 | 46,300 |
Less: |  |  |  |
Net asset optimization (expense)/revenues |  | 0 | 0 |
Retail Gross Margin |  | 36,476 | 15,406 |
Total Assets |  | 666,742 |  | 577,695
Goodwill |  | 76,877 |  | 76,617
Operating Segments | Retail Electricity | Non-trading |  |  |  |
Less: |  |  |  |
(Losses) gains on non-trading derivatives |  | (19,287) | (9,390) |
Current period settlements on non-trading derivatives |  | 7,764 | 9,617 |
Operating Segments | Retail Natural Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues |  | 62,612 | 48,613 |
Retail cost of revenues |  | 36,918 | 22,500 |
Less: |  |  |  |
Net asset optimization (expense)/revenues |  | (194) | 527 |
Retail Gross Margin |  | 27,828 | 24,156 |
Total Assets |  | 272,045 |  | 242,739
Goodwill |  | 2,530 |  | 2,530
Operating Segments | Retail Natural Gas | Non-trading |  |  |  |
Less: |  |  |  |
(Losses) gains on non-trading derivatives |  | (1,750) | (230) |
Current period settlements on non-trading derivatives |  | (190) | 1,660 |
Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues |  | 0 | 0 |
Retail cost of revenues |  | 0 | 0 |
Less: |  |  |  |
Net asset optimization (expense)/revenues |  | 0 | 0 |
Retail Gross Margin |  | 0 | 0 |
Total Assets |  | 163,806 |  | 169,404
Goodwill |  | 0 |  |
Corporate and Other | Non-trading |  |  |  |
Less: |  |  |  |
(Losses) gains on non-trading derivatives |  | 0 | 0 |
Current period settlements on non-trading derivatives |  | 0 | 0 |
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues |  | 0 | 0 |
Retail cost of revenues |  | 0 | 0 |
Less: |  |  |  |
Net asset optimization (expense)/revenues |  | 0 | 0 |
Retail Gross Margin |  | 0 | 0 |
Total Assets |  | (736,776) |  | (613,670)
Goodwill |  | 0 |  | $ 0
Eliminations | Non-trading |  |  |  |
Less: |  |  |  |
(Losses) gains on non-trading derivatives |  | 0 | 0 |
Current period settlements on non-trading derivatives |  | $ 0 | $ 0 |
[1] | Retail cost of revenues includes retail cost of revenues—affiliates of $0 and less than $100 for the three months ended March 31, 2017 and 2016, respectively.
[2] | Net asset optimization revenues (expenses) includes asset optimization revenues —affiliates of $0 and $113 for the three months ended March 31, 2017 and 2016, respectively, and asset optimization revenues—affiliates cost of revenues of $0 and $1,258 for the three months ended March 31, 2017 and 2016, respectively.

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