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Acquisitions - Pro-forma Information (Details) - MicroPact - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]    
Revenues $ 258,864 $ 238,533
Net income $ 26,378 $ 36,282
Basic earnings per share (usd per share) $ 0.69 $ 0.95
Diluted earnings per share (usd per share) $ 0.67 $ 0.91