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Segment Reporting - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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