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Acquisitions - Pro-forma Information (Details) - Socrata, Inc. - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Revenues $ 943,723 $ 865,944
Net income $ 139,315 $ 150,515
Basic earnings per share (usd per share) $ 3.62 $ 4.04
Diluted earnings per share (usd per share) $ 3.47 $ 3.84