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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Revenues: |  |  |
Retail revenues |  | $ 194,539 | $ 110,019
Net asset optimization (expense)/revenues | [1] | (194) | 527
Total Revenues |  | 194,345 | 110,546
Operating Expenses: |  |  |
Retail cost of revenues | [2] | 143,698 | 68,800
General and administrative | [3] | 24,377 | 17,380
Depreciation and amortization |  | 9,232 | 6,789
Total Operating Expenses |  | 177,307 | 92,969
Operating income |  | 17,038 | 17,577
Other (expense)/income: |  |  |
Interest expense |  | (3,445) | (753)
Interest and other income |  | 199 | (95)
Total other expenses |  | (3,246) | (848)
Income before income tax expense |  | 13,792 | 16,729
Income tax expense |  | 2,406 | 988
Net income |  | 11,386 | 15,741
Less: Net income attributable to non-controlling interests |  | 9,117 | 11,568
Net income attributable to Spark Energy, Inc. stockholders |  | 2,269 | 4,173
Other comprehensive loss, net of tax: |  |  |
Foreign currency translation adjustment for equity method investee |  | (49) | 0
Other comprehensive loss |  | (49) | 0
Comprehensive income |  | 11,337 | 15,741
Less: Comprehensive income attributable to non-controlling interests |  | 9,086 | 11,568
Comprehensive income attributable to Spark Energy, Inc. stockholders |  | $ 2,251 | $ 4,173
Net income attributable to Spark Energy, Inc. per share of Class A common stock (4) |  |  |
Basic (in dollars per share) | [4] | $ 0.32 | $ 1.11
Diluted (in dollars per share) | [4] | $ 0.31 | $ 0.68
Weighted average shares of Class A common stock outstanding |  |  |
Basic (in shares) |  | 6,498 | 3,756
Diluted (in shares) |  | 6,634 | 14,520
[1] | Net asset optimization revenues (expenses) includes asset optimization revenues —affiliates of $0 and $113 for the three months ended March 31, 2017 and 2016, respectively, and asset optimization revenues—affiliates cost of revenues of $0 and $1,258 for the three months ended March 31, 2017 and 2016, respectively.
[2] | Retail cost of revenues includes retail cost of revenues—affiliates of $0 and less than $100 for the three months ended March 31, 2017 and 2016, respectively.
[3] | General and administrative includes general and administrative expense—affiliates of $7,300 and $4,400 for the three months ended March 31, 2017 and 2016, respectively.
[4] | In accordance with GAAP, net income attributable to stockholders of Class A common stock is presented net of cumulative Series A Preferred Stock dividends of $183 as of March 31, 2017.

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