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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Revenues | $ 572,123 | $ 442,443 | $ 1,487,491 | $ 1,283,718
Cost of services | 380,719 | 297,605 | 1,001,678 | 868,820
Gross profit | 191,404 | 144,838 | 485,813 | 414,898
Selling, general and administrative expenses | 128,614 | 100,608 | 353,416 | 296,331
Amortization of intangible assets | 11,325 | 5,532 | 23,151 | 16,592
Operating income | 51,465 | 38,698 | 109,246 | 101,975
Interest expense, net | (9,543) | (3,101) | (17,346) | (9,532)
Write off of Deferred Debt Issuance Cost | 0 | 0 | (3,751) | 0
Income before income taxes | 41,922 | 35,597 | 88,149 | 92,443
Provision for income taxes | 17,031 | 14,874 | 35,900 | 38,474
Income from continuing operations | 24,891 | 20,723 | 52,249 | 53,969
Gain on sale of discontinued operations, net of income taxes | 0 | 0 | 25,703 | 0
Income from discontinued operations, net of tax | 34 | 1,282 | 360 | 2,742
Net income | $ 24,925 | $ 22,005 | $ 78,312 | $ 56,711
Basic earnings per common share: |  |  |  |
Income from continuing operations | $ 0.47 | $ 0.39 | $ 1.00 | $ 1.00
Discontinued operations | 0.00 | 0.02 | 0.50 | 0.05
Net income | 0.47 | 0.41 | 1.50 | 1.05
Diluted earnings per common share: |  |  |  |
Income from continuing operations | 0.47 | 0.38 | 0.99 | 0.98
Discontinued operations | 0.00 | 0.03 | 0.49 | 0.05
Net income | $ 0.47 | $ 0.41 | $ 1.48 | $ 1.03
Number of shares and share equivalents used to calculate earnings per share: |  |  |  |
Basic | 52,654 | 53,374 | 52,053 | 53,955
Diluted | 53,304 | 54,129 | 52,759 | 54,804
Reconciliation of net income to comprehensive income: |  |  |  |
Net income | $ 24,925 | $ 22,005 | $ 78,312 | $ 56,711
Changes in fair value of derivatives, net of tax | 0 | 19 | 122 | 70
Foreign currency translation adjustment, net of tax | 290 | (2,884) | (2,606) | (3,088)
Comprehensive income | $ 25,215 | $ 19,140 | $ 75,828 | $ 53,693

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