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Debt - Components of Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Total current debt $ 62,714 $ 62,714 $ 27,806
Total long-term debt 6,542 6,542 20,931
Total debt 69,256 69,256 48,737
Trade Credit Arrangements With Pacific Summit Energy LLC      
Debt Instrument [Line Items]      
Total current debt 13,445 13,445 0
Senior Credit Facility      
Debt Instrument [Line Items]      
Letters of credit issued 33,000 $ 33,000 $ 21,500
Weighted average interest rate on current portion of debt   4.38% 3.90%
Senior Credit Facility | Acquisition Line      
Debt Instrument [Line Items]      
Total long-term debt 0 $ 0 $ 14,592
Convertible Subordinated Notes      
Debt Instrument [Line Items]      
Total long-term debt 6,542 6,542 6,339
Paid in-kind interest 200 400  
Convertible Subordinated Notes | Oasis Note      
Debt Instrument [Line Items]      
Unamortized discount 900 900 700
Senior Credit Facility | Working Capital Line      
Debt Instrument [Line Items]      
Total current debt 26,000 26,000 22,500
Senior Credit Facility | Acquisition Line      
Debt Instrument [Line Items]      
Total current debt $ 23,269 $ 23,269 $ 5,306