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Deferred Revenue and Performance Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Changes in deferred revenue
Changes in total deferred revenue, including long-term, were as follows:
 
 
2018
Balance at beginning of year (As Adjusted)
 
$
299,887

Deferral of revenue
 
871,498

Recognition of deferred revenue
 
(820,449
)
Balance at end of year
 
$
350,936

Total deferred revenue, including long-term, by segment is as follows:
 
 
December 31, 2018
 
December 31, 2017
 
 
 
 
As Adjusted
Enterprise Software
 
$
327,521

 
$
277,198

Appraisal and Tax
 
20,018

 
20,387

Corporate
 
3,397

 
2,302

Totals
 
$
350,936

 
$
299,887