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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenues | $ 685,173 | $ 626,528
Cost of services | 467,436 | 428,384
Gross profit | 217,737 | 198,144
Selling, general and administrative expenses | 164,444 | 146,072
Amortization of intangible assets | 7,601 | 8,464
Operating income | 45,692 | 43,608
Interest expense | (6,545) | (8,501)
Income before income taxes | 39,147 | 35,107
Provision for income taxes | 9,907 | 12,725
Income from continuing operations | 29,240 | 22,382
Income (loss) from discontinued operations, net of income taxes | (148) | 9
Net income | $ 29,092 | $ 22,391
Per share income from continuing operations and net income: |  |
Basic | $ 0.56 | $ 0.43
Diluted | $ 0.55 | $ 0.42
Number of shares and share equivalents used to calculate earnings per share: |  |
Basic | 52,178 | 52,658
Diluted | 52,831 | 53,249
Reconciliation of net income to comprehensive income: |  |
Net income | $ 29,092 | $ 22,391
Foreign currency translation adjustment | 1,475 | 702
Comprehensive income | $ 30,567 | $ 23,093

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