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Acquisitions - Pro-forma Information (Details) - Socrata, Inc. - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Revenues	$ 236,067	$ 220,825	$ 701,742	$ 642,034
Net income	$ 38,924	$ 34,119	$ 107,763	$ 89,599
Basic earnings per share (usd per share)	$ 1.00	$ 0.91	$ 2.80	$ 2.41
Diluted earnings per share (usd per share)	$ 0.96	$ 0.87	$ 2.67	$ 2.28

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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