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Segment Reporting - Financial Data (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | $ 546,697 | [1] | $ 358,153 | [2] | $ 322,876 |
Retail cost of revenues | [3] | 344,944 | [1] | 241,188 | [2] | 258,616 |
Net asset optimization revenues | [4] | 586 | [1] | (1,494) | [2] | (2,318) |
Net, Gain (losses) on non-trading derivative instruments |  | 22,407 |  | (18,497) |  | (14,535) |
Current period settlements on non-trading derivatives |  | (2,146) |  | 20,547 |  | (3,479) |
Retail gross margin |  | 182,369 |  | 113,615 |  | 76,944 |
Total Assets |  | 376,168 | [5] | 162,234 | [5] | 138,397 |
Goodwill |  | 79,147 | [5] | 18,379 | [5] | 0 | $ 0
Non-trading |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net, Gain (losses) on non-trading derivative instruments |  | 22,254 |  | (18,423) |  | (8,713) |
Current period settlements on non-trading derivatives |  | (2,284) |  | 20,279 |  | (6,289) |
Operating Segments | Retail Electricity |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | 417,229 |  | 229,490 |  | 176,406 |
Retail cost of revenues |  | 286,795 |  | 170,684 |  | 149,452 |
Net asset optimization revenues |  | 0 |  | 0 |  | 0 |
Retail gross margin |  | 118,136 |  | 60,255 |  | 32,617 |
Total Assets |  | 577,695 |  | 150,245 |  | 46,848 |
Goodwill |  | 76,617 |  | 16,476 |  |  |
Operating Segments | Retail Electricity | Non-trading |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net, Gain (losses) on non-trading derivative instruments |  | 17,187 |  | (13,348) |  | (518) |
Current period settlements on non-trading derivatives |  | (4,889) |  | 11,899 |  | (5,145) |
Operating Segments | Retail Natural Gas |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | 129,468 |  | 128,663 |  | 146,470 |
Retail cost of revenues |  | 58,149 |  | 70,504 |  | 109,164 |
Net asset optimization revenues |  | (586) |  | (1,494) |  | (2,318) |
Retail gross margin |  | 64,233 |  | 53,360 |  | 44,327 |
Total Assets |  | 242,739 |  | 113,583 |  | 101,711 |
Goodwill |  | 2,530 |  | 1,903 |  |  |
Operating Segments | Retail Natural Gas | Non-trading |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net, Gain (losses) on non-trading derivative instruments |  | 5,067 |  | (5,075) |  | (8,195) |
Current period settlements on non-trading derivatives |  | 2,605 |  | 8,380 |  | (1,144) |
Corporate and Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | 0 |  | 0 |  | 0 |
Retail cost of revenues |  | 0 |  | 0 |  | 0 |
Net asset optimization revenues |  | 0 |  | 0 |  | 0 |
Retail gross margin |  | 0 |  | 0 |  | 0 |
Total Assets |  | 169,404 |  | 88,823 |  | 27,285 |
Goodwill |  | 0 |  | 0 |  |  |
Corporate and Other | Non-trading |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net, Gain (losses) on non-trading derivative instruments |  | 0 |  | 0 |  | 0 |
Current period settlements on non-trading derivatives |  | 0 |  | 0 |  | 0 |
Eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | 0 |  | 0 |  | 0 |
Retail cost of revenues |  | 0 |  | 0 |  | 0 |
Net asset optimization revenues |  | 0 |  | 0 |  | 0 |
Retail gross margin |  | 0 |  | 0 |  | 0 |
Total Assets |  | (613,670) |  | (190,417) |  | (37,447) |
Goodwill |  | 0 |  | 0 |  |  |
Eliminations | Non-trading |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net, Gain (losses) on non-trading derivative instruments |  | 0 |  | 0 |  | 0 |
Current period settlements on non-trading derivatives |  | $ 0 |  | $ 0 |  | $ 0 |
[1] | Financial information has been recast to include results attributable to the acquisition of Major Energy Companies by an affiliate on April 15, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.
[2] | (2) Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC from an affiliate on May 12, 2015. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions", respectively, for further discussion.
[3] | Retail cost of revenues includes retail cost of revenues—affiliates of $9, $17 and $13 for the years December 31, 2016, 2015 and 2014, respectively.
[4] | Net asset optimization revenues includes asset optimization (expense)/revenues—affiliates of $154, $1,101 and $12,842 for the years ended December 31, 2016, 2015 and 2014, respectively, and asset optimization revenues—affiliates cost of revenues of $1,633, $11,285 and $30,910 for the years ended December 31, 2016, 2015 and 2014, respectively.
[5] | See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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