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Segment Reporting - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Retail Gross Margin to Income before taxes      
Income (loss) before income tax expense $ 76,099 [1] $ 27,949 [2] $ (5,156)
Interest and other income (957) [1] (324) [2] (263)
Interest expense 8,859 [1] 2,280 [2] 1,578
Operating Income 84,001 [1] 29,905 [2] (3,841)
Depreciation and amortization [1] 32,788 25,378 22,221
General and administrative [3] 84,964 [1] 61,682 [2] 45,880
Less:      
Net asset optimization revenues [4] (586) [1] 1,494 [2] 2,318
Net, Gain (losses) on non-trading derivative instruments 22,407 (18,497) (14,535)
Net, Cash settlements on non-trading derivative instruments (2,146) 20,547 (3,479)
Retail Gross Margin 182,369 113,615 76,944
Non-trading      
Less:      
Net, Gain (losses) on non-trading derivative instruments 22,254 (18,423) (8,713)
Net, Cash settlements on non-trading derivative instruments $ (2,284) $ 20,279 $ (6,289)
[1] Financial information has been recast to include results attributable to the acquisition of Major Energy Companies by an affiliate on April 15, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.
[2] (2) Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC from an affiliate on May 12, 2015. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions", respectively, for further discussion.
[3] General and administrative includes general and administrative expense—affiliates of $15,700, $0 and less than $100 for the years ended December 31, 2016, 2015 and 2014, respectively.
[4] Net asset optimization revenues includes asset optimization (expense)/revenues—affiliates of $154, $1,101 and $12,842 for the years ended December 31, 2016, 2015 and 2014, respectively, and asset optimization revenues—affiliates cost of revenues of $1,633, $11,285 and $30,910 for the years ended December 31, 2016, 2015 and 2014, respectively.