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Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Revenues $ 501,810 $ 404,490
Operating costs and expenses:    
Costs of services provided 469,904 345,570
Selling, general and administrative expense 33,777 28,210
Other income, net:    
Investment and interest 476 1,569
(Loss) income before income taxes (1,395) 32,279
Income tax (benefit) provision (1,467) 10,262
Net income $ 72 $ 22,017
Per share data:    
Basic earnings per common share (in dollars per share) $ 0.00 $ 0.30
Diluted earnings per common share (in dollars per share) $ 0.00 $ 0.30
Weighted average number of common shares outstanding:    
Basic (in shares) 73,913 73,074
Diluted (in shares) 74,725 73,946
Comprehensive income:    
Net income $ 72 $ 22,017
Other comprehensive income:    
Unrealized (loss) gain on available-for-sale marketable securities, net of taxes (1,138) 479
Total comprehensive (loss) income $ (1,066) $ 22,496