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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.