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Acquisitions - Pro-forma Information (Details) - MicroPact - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Revenues $ 275,400 $ 257,236 $ 809,389 $ 750,240
Net income $ 40,390 $ 40,907 $ 99,449 $ 115,181
Basic earnings per share (usd per share) $ 1.04 $ 1.06 $ 2.58 $ 2.99
Diluted earnings per share (usd per share) $ 1.00 $ 1.01 $ 2.49 $ 2.85