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Segment Reporting - Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Income before income tax expense $ 6,455 $ 1,032 $ 24,442 [1] $ 7,906
Interest and other income (5) (40) (326) [1] (111)
Interest expense 800 615 1,415 [1] 1,150
Operating Income 7,250 1,607 25,531 [1] 8,945
Depreciation and amortization 7,557 4,113 17,873 [1] 10,324
General and Administrative Expense - Affiliates 15,493 10,634 43,909 [1] 28,494
Optimization Revenues - Affiliates (545) (141) 1,317 [1] 1,681
Net, Cash settlements on non-trading derivative instruments     15,120 [1] (7,252)
Retail Gross Margin 26,678 14,619 79,229 50,194
Not Designated as Hedging Instrument        
Segment Reporting Information [Line Items]        
Net, Gains (losses) on non-trading derivative instruments 132 (1,163) (5,876) 5,847
Net, Cash settlements on non-trading derivative instruments $ 4,035 $ 3,039 $ 12,643 $ (9,959)
[1] Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC on May 12, 2015 from an affiliate. See Note 2 “Basis of Presentation” and Note 3 "Acquisitions" for further discussion.