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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Income Statement [Abstract] |  |  |  |
Revenues | $ 1,792,430 | $ 1,872,340 | $ 3,506,167 | $ 3,733,726
Cost of services (including depreciation) | 1,592,213 | 1,644,835 | 3,102,637 | 3,268,315
Gross profit | 200,217 | 227,505 | 403,530 | 465,411
Selling, general and administrative expenses | 156,607 | 149,923 | 315,131 | 295,386
Amortization of intangible assets | 8,141 | 8,731 | 15,636 | 17,024
Operating income | 35,469 | 68,851 | 72,763 | 153,001
Interest expense | (3,583) | (1,675) | (7,172) | (3,075)
Interest income | 641 | 319 | 1,157 | 772
Equity in losses of unconsolidated affiliates | (378) | (314) | (559) | (314)
Other income (expense), net | (725) | (134) | (463) | (346)
Income from continuing operations before income taxes | 31,424 | 67,047 | 65,726 | 150,038
Provision for income taxes | 14,695 | 31,584 | 28,138 | 62,185
Net income from continuing operations | 16,729 | 35,463 | 37,588 | 87,853
Net income from discontinued operations |  | 14,102 |  | 19,897
Net income | 16,729 | 49,565 | 37,588 | 107,750
Less: Net income attributable to non-controlling interests | 167 | 3,456 | 530 | 8,157
Net income attributable to common stock | 16,562 | 46,109 | 37,058 | 99,593
Amounts attributable to common stock: |  |  |  |
Net income from continuing operations | 16,562 | 32,007 | 37,058 | 79,696
Net income from discontinued operations |  | 14,102 |  | 19,897
Net income attributable to common stock | $ 16,562 | $ 46,109 | $ 37,058 | $ 99,593
Earnings per share attributable to common stock - basic and diluted: |  |  |  |
Continuing operations | $ 0.11 | $ 0.15 | $ 0.23 | $ 0.37
Discontinued operations |  | 0.07 |  | 0.09
Net income attributable to common stock | $ 0.11 | $ 0.22 | $ 0.23 | $ 0.46
Shares used in computing earnings per share: |  |  |  |
Weighted average basic shares outstanding | 156,128 | 213,047 | 159,577 | 214,257
Weighted average diluted shares outstanding | 156,130 | 213,059 | 159,579 | 214,269

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