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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Statement [Abstract] |  |  |  |
Revenues | $ 2,042,186 | $ 1,939,438 | $ 5,548,353 | $ 5,673,164
Cost of services (including depreciation) | 1,739,604 | 1,704,223 | 4,842,241 | 4,972,538
Gross profit | 302,582 | 235,215 | 706,112 | 700,626
Selling, general and administrative expenses | 164,325 | 145,687 | 479,456 | 441,073
Amortization of intangible assets | 8,094 | 8,650 | 23,730 | 25,674
Operating income | 130,163 | 80,878 | 202,926 | 233,879
Interest expense | (3,726) | (2,021) | (10,898) | (5,096)
Interest income | 874 | 346 | 2,031 | 1,118
Equity in losses of unconsolidated affiliates | (89) |  | (648) | (314)
Other income (expense), net | 841 | (1,070) | 378 | (1,416)
Income from continuing operations before income taxes | 128,063 | 78,133 | 193,789 | 228,171
Provision for income taxes | 54,516 | 32,389 | 82,654 | 94,574
Net income from continuing operations | 73,547 | 45,744 | 111,135 | 133,597
Net income from discontinued operations | 605 | 173,212 | 605 | 193,109
Net income | 74,152 | 218,956 | 111,740 | 326,706
Less: Net income attributable to non-controlling interests | 410 | 2,568 | 940 | 10,725
Net income attributable to common stock | 73,742 | 216,388 | 110,800 | 315,981
Amounts attributable to common stock: |  |  |  |
Net income from continuing operations | 73,137 | 43,176 | 110,195 | 122,872
Net income from discontinued operations | 605 | 173,212 | 605 | 193,109
Net income attributable to common stock | $ 73,742 | $ 216,388 | $ 110,800 | $ 315,981
Earnings per share attributable to common stock - basic and diluted: |  |  |  |
Continuing operations | $ 0.47 | $ 0.23 | $ 0.70 | $ 0.59
Discontinued operations | 0.01 | 0.92 |  | 0.94
Net income attributable to common stock | $ 0.48 | $ 1.15 | $ 0.70 | $ 1.53
Shares used in computing earnings per share: |  |  |  |
Weighted average basic shares outstanding | 155,024 | 188,951 | 158,090 | 206,181
Weighted average diluted shares outstanding | 155,024 | 188,961 | 158,090 | 206,193

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