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Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue	$ 241,981	$ 236,067	$ 236,060	$ 221,174	$ 217,701	$ 214,706	$ 208,763	$ 199,729		$ 935,282	$ 840,899	$ 759,880
Operating segments | Enterprise Software
Disaggregation of Revenue [Line Items]
Revenue										853,200	765,133	689,739
Operating segments | Appraisal and Tax
Disaggregation of Revenue [Line Items]
Revenue										90,356	81,579	73,868
Intercompany
Disaggregation of Revenue [Line Items]
Revenue										(13,155)	(10,425)	(6,742)
Intercompany | Enterprise Software
Disaggregation of Revenue [Line Items]
Revenue										13,155	10,425	6,742
Intercompany | Appraisal and Tax
Disaggregation of Revenue [Line Items]
Revenue										0	0	0
Corporate and Elimination
Disaggregation of Revenue [Line Items]
Revenue										(8,274)	(5,813)	(3,727)
Recurring revenues
Disaggregation of Revenue [Line Items]
Revenue										605,069	531,495
Recurring revenues | Enterprise Software
Disaggregation of Revenue [Line Items]
Revenue										570,645	502,018
Recurring revenues | Appraisal and Tax
Disaggregation of Revenue [Line Items]
Revenue										34,424	29,477
Recurring revenues | Corporate
Disaggregation of Revenue [Line Items]
Revenue										0	0
Non-recurring revenues
Disaggregation of Revenue [Line Items]
Revenue										330,213	309,404
Non-recurring revenues | Enterprise Software
Disaggregation of Revenue [Line Items]
Revenue										269,400	252,690
Non-recurring revenues | Appraisal and Tax
Disaggregation of Revenue [Line Items]
Revenue										55,932	52,102
Non-recurring revenues | Corporate
Disaggregation of Revenue [Line Items]
Revenue										$ 4,881	4,612
Minimum
Disaggregation of Revenue [Line Items]
Contract term (in years)										1 year
Typical contract term (in years)									3 years	3 years
Maximum
Disaggregation of Revenue [Line Items]
Contract term (in years)										10 years
Typical contract term (in years)									5 years	5 years
Products and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue										$ 98,846	86,846
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue										836,436	754,053
Software licenses and royalties
Disaggregation of Revenue [Line Items]
Revenue										93,441	86,242	83,733
Software licenses and royalties | Enterprise Software
Disaggregation of Revenue [Line Items]
Revenue										83,735	78,388	78,271
Software licenses and royalties | Appraisal and Tax
Disaggregation of Revenue [Line Items]
Revenue										9,706	7,854	5,462
Software licenses and royalties | Corporate
Disaggregation of Revenue [Line Items]
Revenue										0	0	0
Software licenses and royalties | Products and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue										75,188	69,167
Software licenses and royalties | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue										18,253	17,075
Subscriptions
Disaggregation of Revenue [Line Items]
Revenue										220,547	172,176	142,657
Subscriptions | Enterprise Software
Disaggregation of Revenue [Line Items]
Revenue										210,740	164,317	135,469
Subscriptions | Appraisal and Tax
Disaggregation of Revenue [Line Items]
Revenue										9,807	7,859	7,188
Subscriptions | Corporate
Disaggregation of Revenue [Line Items]
Revenue										0	0	0
Subscriptions | Products and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue										0	0
Subscriptions | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue										220,547	172,176
Software services
Disaggregation of Revenue [Line Items]
Revenue										191,269	180,460	171,648
Software services | Enterprise Software
Disaggregation of Revenue [Line Items]
Revenue										166,921	161,245	155,322
Software services | Appraisal and Tax
Disaggregation of Revenue [Line Items]
Revenue										24,348	19,215	16,326
Software services | Corporate
Disaggregation of Revenue [Line Items]
Revenue										0	0	0
Software services | Products and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue										0	0
Software services | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue										191,269	180,460
Maintenance
Disaggregation of Revenue [Line Items]
Revenue										384,521	359,319	320,998
Maintenance | Enterprise Software
Disaggregation of Revenue [Line Items]
Revenue										359,904	337,701	302,409
Maintenance | Appraisal and Tax
Disaggregation of Revenue [Line Items]
Revenue										24,617	21,618	18,589
Maintenance | Corporate
Disaggregation of Revenue [Line Items]
Revenue										0	0	0
Maintenance | Products and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue										0	0
Maintenance | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue										384,521	359,319
Appraisal services
Disaggregation of Revenue [Line Items]
Revenue										21,846	25,023	26,287
Appraisal services | Enterprise Software
Disaggregation of Revenue [Line Items]
Revenue										0	0	0
Appraisal services | Appraisal and Tax
Disaggregation of Revenue [Line Items]
Revenue										21,846	25,023	26,287
Appraisal services | Corporate
Disaggregation of Revenue [Line Items]
Revenue										0	0	$ 0
Appraisal services | Minimum
Disaggregation of Revenue [Line Items]
Contract term (in years)									1 year
Appraisal services | Maximum
Disaggregation of Revenue [Line Items]
Contract term (in years)									3 years
Appraisal services | Products and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue										0	0
Appraisal services | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue										21,846	25,023
Hardware and other
Disaggregation of Revenue [Line Items]
Revenue										23,658	17,679
Hardware and other | Products and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue										23,658	17,679
Hardware and other | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenue										$ 0	$ 0

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