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Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Revenues $ 392,734 $ 360,165 $ 1,164,097 $ 1,070,767
Operating costs and expenses:        
Costs of services provided 336,340 308,645 998,595 916,798
Selling, general and administrative expense 27,182 23,445 78,192 75,332
Other income (expense), net:        
Investment and interest 1,359 (1,334) 2,548 (585)
Income before income taxes 30,571 26,741 89,858 78,052
Income tax provision 10,860 9,655 32,761 29,162
Net income $ 19,711 $ 17,086 $ 57,097 $ 48,890
Per share data:        
Basic earnings per common share (in dollars per share) $ 0.27 $ 0.24 $ 0.79 $ 0.68
Diluted earnings per common share (in dollars per share) $ 0.27 $ 0.24 $ 0.78 $ 0.68
Weighted average number of common shares outstanding:        
Basic (in shares) 72,839 72,009 72,718 71,714
Diluted (in shares) 73,592 72,691 73,435 72,381
Comprehensive income:        
Net income $ 19,711 $ 17,086 $ 57,097 $ 48,890
Other comprehensive income:        
Unrealized gain (loss) on available for sale marketable securities, net of taxes (369) 198 765 181
Total comprehensive income $ 19,342 $ 17,284 $ 57,862 $ 49,071