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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Income Statement [Abstract] |  |  |  |
Revenues | $ 386,556 | $ 355,356 | $ 771,363 | $ 710,602
Operating costs and expenses: |  |  |  |
Costs of services provided | 332,211 | 304,217 | 662,255 | 608,153
Selling, general and administrative expense | 25,664 | 25,124 | 51,010 | 51,887
Other income, net: |  |  |  |
Investment and interest | 1,002 | 242 | 1,189 | 749
Income before income taxes | 29,683 | 26,257 | 59,287 | 51,311
Income tax provision | 10,923 | 9,969 | 21,901 | 19,507
Net income | $ 18,760 | $ 16,288 | $ 37,386 | $ 31,804
Per share data: |  |  |  |
Basic earnings per common share (in dollars per share) | $ 0.26 | $ 0.23 | $ 0.52 | $ 0.44
Diluted earnings per common share (in dollars per share) | $ 0.26 | $ 0.23 | $ 0.51 | $ 0.44
Weighted average number of common shares outstanding: |  |  |  |
Basic (in shares) | 72,568 | 71,657 | 72,466 | 71,563
Diluted (in shares) | 73,316 | 72,286 | 73,165 | 72,223
Comprehensive income: |  |  |  |
Net income | $ 18,760 | $ 16,288 | $ 37,386 | $ 31,804
Other comprehensive income: |  |  |  |
Unrealized gain (loss) on available for sale marketable securities, net of taxes | 578 | (20) | 1,133 | (17)
Total comprehensive income | $ 19,338 | $ 16,268 | $ 38,519 | $ 31,787

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