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Consolidated Statements Of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Revenues $ 1,562,662 $ 1,436,849 $ 1,293,183
Operating costs and expenses:      
Costs of services provided 1,339,492 1,236,108 1,155,293
Selling, general and administrative 105,417 111,689 107,810
Other income:      
Investment and interest 2,634 712 1,628
Income before income taxes 120,387 89,764 31,708
Income taxes 42,991 31,740 9,858
Net income $ 77,396 $ 58,024 $ 21,850
Per share data:      
Basic earnings per common share (in dollars per share) $ 1.06 $ 0.81 $ 0.31
Diluted earnings per common share (in dollars per share) $ 1.05 $ 0.80 $ 0.31
Weighted average number of common shares outstanding:      
Basic (in shares) 72,754 71,826 70,616
Diluted (in shares) 73,474 72,512 71,341
Comprehensive income:      
Net income $ 77,396 $ 58,024 $ 21,850
Other comprehensive income:      
Unrealized (loss) gain on available for sale marketable securities, net of taxes (862) 518 (24)
Total comprehensive income $ 76,534 $ 58,542 $ 21,826