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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.

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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