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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Income Statement [Abstract] |  |  |  |
Revenues | $ 1,872,340 | $ 1,838,209 | $ 3,733,726 | $ 3,573,657
Cost of services (including depreciation) | 1,644,835 | 1,574,000 | 3,268,315 | 3,053,394
Gross profit | 227,505 | 264,209 | 465,411 | 520,263
Selling, general and administrative expenses | 149,923 | 135,210 | 295,386 | 304,099
Amortization of intangible assets | 8,731 | 8,202 | 17,024 | 16,035
Operating income | 68,851 | 120,797 | 153,001 | 200,129
Interest expense | (1,675) | (1,128) | (3,075) | (2,110)
Interest income | 319 | 599 | 772 | 2,141
Equity in earnings (losses) of unconsolidated affiliates | (314) | (332) | (314) | (332)
Other income (expense), net | (134) | (901) | (346) | (257)
Income from continuing operations before income taxes | 67,047 | 119,035 | 150,038 | 199,571
Provision for income taxes | 31,584 | 41,220 | 62,185 | 70,074
Net income from continuing operations | 35,463 | 77,815 | 87,853 | 129,497
Net income from discontinued operations | 14,102 | 7,629 | 19,897 | 14,595
Net income | 49,565 | 85,444 | 107,750 | 144,092
Less: Net income attributable to non-controlling interests | 3,456 | 4,362 | 8,157 | 8,602
Net income attributable to common stock | 46,109 | 81,082 | 99,593 | 135,490
Amounts attributable to common stock: |  |  |  |
Net income from continuing operations | 32,007 | 73,453 | 79,696 | 120,895
Net income from discontinued operations | 14,102 | 7,629 | 19,897 | 14,595
Net income attributable to common stock | $ 46,109 | $ 81,082 | $ 99,593 | $ 135,490
Earnings per share attributable to common stock-basic and diluted: |  |  |  |
Continuing operations | $ 0.15 | $ 0.33 | $ 0.37 | $ 0.55
Discontinued operations | 0.07 | 0.04 | 0.09 | 0.07
Net income attributable to common stock | $ 0.22 | $ 0.37 | $ 0.46 | $ 0.62
Shares used in computing earnings per share: |  |  |  |
Weighted average basic shares outstanding | 213,047 | 219,612 | 214,257 | 219,345
Weighted average diluted shares outstanding | 213,059 | 219,642 | 214,269 | 219,375

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