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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |
Revenues | $ 6,522,842 | $ 5,920,269 | $ 4,193,764
Cost of services (including depreciation) | 5,467,389 | 4,982,562 | 3,632,048
Gross profit | 1,055,453 | 937,707 | 561,716
Selling, general and administrative expenses | 501,010 | 434,894 | 337,835
Amortization of intangible assets | 27,515 | 37,691 | 29,039
Operating income | 526,928 | 465,122 | 194,842
Interest expense | (2,668) | (3,746) | (1,803)
Interest income | 3,380 | 1,471 | 1,066
Equity in earnings of unconsolidated affiliates, including gain on sale of investment | 112,744 | 2,084 |
Other income (expense), net | (1,135) | (351) | (597)
Income from continuing operations before income taxes | 639,249 | 464,580 | 193,508
Provision for income taxes | 217,940 | 158,859 | 63,096
Net income from continuing operations | 421,309 | 305,721 | 130,412
Income from discontinued operations, net of taxes |  | 16,935 | 14,004
Net income | 421,309 | 322,656 | 144,416
Less: Net income attributable to noncontrolling interests | 19,388 | 16,027 | 11,901
Net income attributable to common stock | 401,921 | 306,629 | 132,515
Amounts attributable to common stock: |  |  |
Net income from continuing operations | 401,921 | 289,694 | 118,511
Net income from discontinued operations |  | 16,935 | 14,004
Net income attributable to common stock | $ 401,921 | $ 306,629 | $ 132,515
Earnings per share attributable to common stock - basic and diluted: |  |  |
Continuing operations | $ 1.87 | $ 1.36 | $ 0.56
Discontinued operations |  | $ 0.08 | $ 0.06
Net income attributable to common stock | $ 1.87 | $ 1.44 | $ 0.62
Shares used in computing earnings per share: |  |  |
Weighted average basic shares outstanding | 214,929 | 212,777 | 212,648
Weighted average diluted shares outstanding | 214,978 | 212,835 | 213,168

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