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Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Revenues $ 503,732 $ 470,876 $ 1,005,542 $ 875,366
Operating costs and expenses:        
Costs of services provided 437,618 407,322 907,522 752,892
Selling, general and administrative expense 34,118 31,991 67,895 60,201
Other income, net:        
Investment and interest, net 1,320 1,515 1,796 3,084
Income before income taxes 33,316 33,078 31,921 65,357
Income tax provision 7,502 10,527 6,035 20,789
Net income $ 25,814 $ 22,551 $ 25,886 $ 44,568
Per share data:        
Basic earnings per common share (in dollars per share) $ 0.35 $ 0.31 $ 0.35 $ 0.61
Diluted earnings per common share (in dollars per share) $ 0.35 $ 0.30 $ 0.35 $ 0.60
Weighted average number of common shares outstanding:        
Basic (in shares) 73,982 73,276 73,947 73,176
Diluted (in shares) 74,487 74,269 74,606 74,108
Comprehensive income:        
Net income $ 25,814 $ 22,551 $ 25,886 $ 44,568
Other comprehensive income:        
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes 97 602 (1,041) 1,081
Total comprehensive income $ 25,911 $ 23,153 $ 24,845 $ 45,649