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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.