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Deferred Revenue and Performance Obligations - Deferred Revenue (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Disaggregation of Revenue  
Deferred revenue $ 412,694
Contract With Customer Liability  
Beginning balance 412,694
Deferral of revenue 798,656
Recognition of deferred revenue (774,728)
Ending balance 436,622
Operating segments | Enterprise Software  
Disaggregation of Revenue  
Deferred revenue 375,838
Contract With Customer Liability  
Beginning balance 375,838
Ending balance 410,796
Operating segments | Appraisal and Tax  
Disaggregation of Revenue  
Deferred revenue 35,487
Contract With Customer Liability  
Beginning balance 35,487
Ending balance 23,764
Corporate  
Disaggregation of Revenue  
Deferred revenue 1,369
Contract With Customer Liability  
Beginning balance 1,369
Ending balance $ 2,062