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Deferred Revenue and Performance Obligations - Deferred Revenue (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
Disaggregation of Revenue  
Deferred revenue $ 484,550
Contract With Customer Liability  
Beginning balance 461,378
Deferral of revenue 569,106
Recognition of deferred revenue (545,934)
Ending balance 484,550
Operating segments | Enterprise Software  
Disaggregation of Revenue  
Deferred revenue 442,822
Contract With Customer Liability  
Beginning balance 422,742
Ending balance 442,822
Operating segments | Appraisal and Tax  
Disaggregation of Revenue  
Deferred revenue 37,419
Contract With Customer Liability  
Beginning balance 36,945
Ending balance 37,419
Operating segments | NIC  
Disaggregation of Revenue  
Deferred revenue 2,719
Contract With Customer Liability  
Beginning balance 0
Ending balance 2,719
Corporate  
Disaggregation of Revenue  
Deferred revenue 1,590
Contract With Customer Liability  
Beginning balance 1,691
Ending balance $ 1,590