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Deferred Revenue and Performance Obligations - Deferred Revenue (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Disaggregation of Revenue  
Deferred revenue $ 461,378
Contract With Customer Liability  
Beginning balance 461,378
Deferral of revenue 231,991
Recognition of deferred revenue (272,751)
Ending balance 420,618
Operating segments | Enterprise Software  
Disaggregation of Revenue  
Deferred revenue 422,742
Contract With Customer Liability  
Beginning balance 422,742
Ending balance 395,374
Operating segments | Appraisal and Tax  
Disaggregation of Revenue  
Deferred revenue 36,945
Contract With Customer Liability  
Beginning balance 36,945
Ending balance 23,551
Corporate  
Disaggregation of Revenue  
Deferred revenue 1,691
Contract With Customer Liability  
Beginning balance 1,691
Ending balance $ 1,693