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CONDENSED COMBINED AND CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Revenues: |  |  |  |
Retail revenues (including retail revenues—affiliates of $0 and $681 for the three months ended June 30, 2015 and 2014, respectively and retail revenues—affiliates of $0 and $2,170 for the six months ended June 30, 2015 and 2014, respectively) | $ 65,500 | $ 65,743 | $ 165,375 | $ 170,095
Net asset optimization (expenses) revenues (including asset optimization revenues—affiliates of $176 and $4,634 for the three months ended June 30, 2015 and 2014, respectively, and asset optimization revenues—affiliates cost of revenues of $3,114 and $10,654 for the three months ended June 30, 2015 and 2014, respectively and asset optimization revenues—affiliates of $665 and $7,134 for the six months ended June 30, 2015 and 2014, respectively, and asset optimization revenues—affiliates cost of revenues of | (67) | 197 | 1,862 | 1,821
Total Revenues | 65,433 | 65,940 | 167,237 | 171,916
Operating Expenses: |  |  |  |
Retail cost of revenues (including retail cost of revenues—affiliates of less than $0.1 million for both the three months and six months ended June 30, 2015 and 2014) | 42,120 | 52,387 | 111,207 | 140,508
General and administrative (including general and administrative expense—affiliates of $0 and $6 for the three months ended June 30, 2015 and 2014, respectively and general and administrative expense—affiliates of $0 and $12 million for the six months ended June 30, 2015 and 2014, respectively) | 12,978 | 9,747 | 27,683 | 17,860
Depreciation and amortization | 5,231 | 3,252 | 9,508 | 6,211
Total Operating Expenses | 60,329 | 65,386 | 148,398 | 164,579
Operating income | 5,104 | 554 | 18,839 | 7,337
Other (expense)/income: |  |  |  |
Interest expense | (207) | (222) | (588) | (535)
Interest and other income | 187 | 1 | 322 | 71
Total other expenses | (20) | (221) | (266) | (464)
Income before income tax expense | 5,084 | 333 | 18,573 | 6,873
Income tax expense | 459 | 132 | 1,019 | 164
Net income | 4,625 | 201 | 17,554 | 6,709
Less: Net income attributable to non-controlling interests | 3,917 | 0 | 14,437 | 0
Net income attributable to Spark Energy, Inc. stockholders | $ 708 | $ 201 | $ 3,117 | $ 6,709
Net income attributable to Spark Energy, Inc. per share of Class A common stock |  |  |  |
Basic (in dollars per share) | $ 0.23 |  | $ 1.03 |
Diluted (in dollars per share) | $ 0.23 |  | $ 0.83 |
Weighted average shares of Class A common stock outstanding |  |  |  |
Basic (in shares) | 3,062 |  | 3,031 |
Diluted (in shares) | 3,062 |  | 13,781 |

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