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Segment Reporting - Financial Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Total Revenues $ 65,433 $ 65,940 $ 167,237 $ 171,916  
Retail cost of revenues 42,120 52,387 111,207 140,508  
Optimization Revenues - Affiliates (67) 197 1,862 1,821  
Current period settlements on derivatives     8,547 (10,256)  
Retail gross margin 23,093 17,891 50,967 35,575  
Total Assets 108,540 86,458 108,540 86,458 $ 138,397
Not Designated as Hedging Instrument          
Segment Reporting Information [Line Items]          
Gain (Loss) on derivatives, net (4,041) (4,438) (5,241) 7,010  
Current period settlements on derivatives 4,328 (97) 8,442 (12,998)  
Operating Segments | Retail Electricity          
Segment Reporting Information [Line Items]          
Total Revenues 44,072 42,771 88,521 86,219  
Retail cost of revenues 32,745 35,753 68,365 73,370  
Optimization Revenues - Affiliates 0 0 0 0  
Retail gross margin 13,662 10,773 23,222 17,749  
Total Assets 62,457 38,606 62,457 38,606  
Operating Segments | Retail Electricity | Not Designated as Hedging Instrument          
Segment Reporting Information [Line Items]          
Gain (Loss) on derivatives, net (4,692) (4,297) (5,324) 5,596  
Current period settlements on derivatives 2,357 542 2,258 (10,496)  
Operating Segments | Retail Natural Gas          
Segment Reporting Information [Line Items]          
Total Revenues 21,361 23,169 78,716 85,697  
Retail cost of revenues 9,375 16,634 42,842 67,138  
Optimization Revenues - Affiliates (67) 197 1,862 1,821  
Retail gross margin 9,431 7,118 27,745 17,826  
Total Assets 93,852 79,570 93,852 79,570  
Operating Segments | Retail Natural Gas | Not Designated as Hedging Instrument          
Segment Reporting Information [Line Items]          
Gain (Loss) on derivatives, net 651 (141) 83 1,414  
Current period settlements on derivatives 1,971 (639) 6,184 (2,502)  
Corporate, Non-Segment          
Segment Reporting Information [Line Items]          
Total Revenues 0 0 0 0  
Retail cost of revenues 0 0 0 0  
Optimization Revenues - Affiliates 0 0 0 0  
Retail gross margin 0 0 0 0  
Total Assets 33,724 1,623 33,724 1,623  
Corporate, Non-Segment | Not Designated as Hedging Instrument          
Segment Reporting Information [Line Items]          
Gain (Loss) on derivatives, net 0 0 0 0  
Current period settlements on derivatives 0 0 0 0  
Eliminations          
Segment Reporting Information [Line Items]          
Total Revenues 0 0 0 0  
Retail cost of revenues 0 0 0 0  
Optimization Revenues - Affiliates 0 0 0 0  
Retail gross margin 0 0 0 0  
Total Assets (81,493) (33,341) (81,493) (33,341)  
Eliminations | Not Designated as Hedging Instrument          
Segment Reporting Information [Line Items]          
Gain (Loss) on derivatives, net 0 0 0 0  
Current period settlements on derivatives $ 0 $ 0 $ 0 $ 0