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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Income Statement [Abstract] |  |
Revenues | $ 384,807 | $ 355,246
Operating costs and expenses: |  |
Costs of services provided | 330,044 | 303,936
Selling, general and administrative expense | 25,346 | 26,763
Other income, net: |  |
Investment and interest | 187 | 507
Income before income taxes | 29,604 | 25,054
Income tax provision | 10,978 | 9,538
Net income | $ 18,626 | $ 15,516
Per share data: |  |
Basic earnings per common share (dollars per share) | $ 0.26 | $ 0.22
Diluted earnings per common share (dollars per share) | $ 0.26 | $ 0.22
Weighted average number of common shares outstanding: |  |
Basic (shares) | 72,364 | 71,469
Diluted (shares) | 73,014 | 72,159
Comprehensive income: |  |
Net income | $ 18,626 | $ 15,516
Other comprehensive income: |  |
Unrealized gain on available for sale marketable securities, net of taxes | 555 | 3
Total comprehensive income | $ 19,181 | $ 15,519

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