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Segment Reporting - Financial Data for Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Total Revenues $ 127,154 $ 113,005  
Retail cost of revenues 68,707 122,168  
Less:      
Net asset optimization expense (904) (140)  
Net, gain on non-trading derivative instruments 45,063 7,024  
Current period settlements on non-trading derivatives (13,136) (1,185)  
Non-recurring event - Winter Storm Uri 0 64,900  
Retail Gross Margin 28,755 50,012  
Total Assets 352,748   $ 355,276
Goodwill 120,343   120,343
Gain on non-trading derivatives, net      
Less:      
Net, gain on non-trading derivative instruments 43,916 7,054  
Current period settlements on non-trading derivatives (13,320) (1,189)  
Operating Segments | Retail Electricity      
Segment Reporting Information [Line Items]      
Total Revenues 88,041 78,755  
Retail cost of revenues 46,160 107,524  
Less:      
Net asset optimization expense 0  
Non-recurring event - Winter Storm Uri   64,900  
Retail Gross Margin 17,186 30,614  
Total Assets 1,613,559   1,527,456
Goodwill 117,813   117,813
Operating Segments | Retail Electricity | Gain on non-trading derivatives, net      
Less:      
Net, gain on non-trading derivative instruments 36,239 6,705  
Current period settlements on non-trading derivatives (11,544) (1,188)  
Operating Segments | Retail Natural Gas      
Segment Reporting Information [Line Items]      
Total Revenues 40,017 34,390  
Retail cost of revenues 22,547 14,644  
Less:      
Net asset optimization expense 0 0  
Non-recurring event - Winter Storm Uri   0  
Retail Gross Margin 11,569 19,398  
Total Assets 33,773   7,320
Goodwill 2,530   2,530
Operating Segments | Retail Natural Gas | Gain on non-trading derivatives, net      
Less:      
Net, gain on non-trading derivative instruments 7,677 349  
Current period settlements on non-trading derivatives (1,776) (1)  
Corporate and Other      
Segment Reporting Information [Line Items]      
Total Revenues (904) (140)  
Retail cost of revenues 0 0  
Less:      
Net asset optimization expense (904) (140)  
Non-recurring event - Winter Storm Uri   0  
Retail Gross Margin 0 0  
Total Assets 317,615   311,556
Goodwill 0   0
Corporate and Other | Gain on non-trading derivatives, net      
Less:      
Net, gain on non-trading derivative instruments 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 0 0  
Non-recurring event - Winter Storm Uri   0  
Retail Gross Margin 0 0  
Total Assets (1,612,199)   (1,491,056)
Goodwill 0   $ 0
Eliminations | Gain on non-trading derivatives, net      
Less:      
Net, gain on non-trading derivative instruments 0 0  
Current period settlements on non-trading derivatives $ 0 $ 0