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Summary of Significant Accounting Policies - New Accounting Standard (Details) - USD ($) $ / shares in Units, $ in Thousands	3 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	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Income Statement [Abstract]
Revenue	$ 241,981	$ 236,067	$ 236,060	$ 221,174	$ 217,701	$ 214,706	$ 208,763	$ 199,729	$ 935,282	$ 840,899	$ 759,880
Selling, general and administrative expenses									207,605	175,914	165,176
Amortization of customer and trade name intangibles									16,217	13,381	13,202
Operating income									152,492	162,758	137,656
Income tax (benefit) provision									8,408	(6,115)	21,957
Net income	$ 31,552	$ 38,924	$ 39,161	$ 37,825	$ 66,196	$ 38,836	$ 31,770	$ 32,769	$ 147,462	$ 169,571	$ 113,701
Earnings per common share:
Basic (USD per share)									$ 3.84	$ 4.55	$ 3.12
Diluted (USD per share)	$ 0.79	$ 0.96	$ 0.97	$ 0.95	$ 1.68	$ 0.99	$ 0.81	$ 0.84	$ 3.68	$ 4.32	$ 2.92
Balance Sheet [Abstract]
Accounts receivable	$ 298,912				$ 246,188				$ 298,912	$ 246,188
Prepaid expenses	33,258				32,206				33,258	32,206
Accounts receivable, long-term	16,020				12,107				16,020	12,107
Other intangibles, net	276,852				229,617				276,852	229,617
Total assets	1,790,963				1,611,351				1,790,963	1,611,351	$ 1,378,503
Deferred revenue	350,512				298,613				350,512	298,613
Deferred income taxes					46,879					46,879
Retained earnings	771,925				624,463				771,925	624,463
Liabilities and Equity	$ 1,790,963				1,611,351				1,790,963	1,611,351
Software licenses and royalties
Income Statement [Abstract]
Revenue									93,441	86,242	83,733
Subscriptions
Income Statement [Abstract]
Revenue									220,547	172,176	142,657
Software services
Income Statement [Abstract]
Revenue									191,269	180,460	171,648
Maintenance
Income Statement [Abstract]
Revenue									384,521	359,319	320,998
Appraisal services
Income Statement [Abstract]
Revenue									21,846	25,023	26,287
Hardware and other
Income Statement [Abstract]
Revenue									$ 23,658	17,679	14,557
As Reported
Income Statement [Abstract]
Revenue										840,662	756,043
Selling, general and administrative expenses										176,974	167,161
Amortization of customer and trade name intangibles										13,912	13,731
Operating income										160,930	131,305
Income tax (benefit) provision										(2,317)	19,450
Net income										$ 163,945	$ 109,857
Earnings per common share:
Basic (USD per share)										$ 4.40	$ 3.01
Diluted (USD per share)										$ 4.18	$ 2.87
Balance Sheet [Abstract]
Accounts receivable					227,127					$ 227,127
Prepaid expenses					27,252					27,252
Accounts receivable, long-term					7,536					7,536
Other intangibles, net					236,444					236,444
Total assets					1,589,592					1,589,592
Deferred revenue					309,461					309,461
Deferred income taxes					38,914					38,914
Retained earnings					599,821					599,821
Liabilities and Equity					1,589,592					1,589,592
As Reported | Software licenses and royalties
Income Statement [Abstract]
Revenue										75,694	$ 74,306
As Reported | Subscriptions
Income Statement [Abstract]
Revenue										173,510	142,704
As Reported | Software services
Income Statement [Abstract]
Revenue										187,149	174,804
As Reported | Maintenance
Income Statement [Abstract]
Revenue										361,569	322,969
As Reported | Appraisal services
Income Statement [Abstract]
Revenue										25,023	26,287
As Reported | Hardware and other
Income Statement [Abstract]
Revenue										17,717	14,973
Adjustments | Accounting Standards Update 2014-09
Income Statement [Abstract]
Revenue										237	3,837
Selling, general and administrative expenses										(1,060)	(1,985)
Amortization of customer and trade name intangibles										(531)	(529)
Operating income										1,828	6,351
Income tax (benefit) provision										(3,798)	2,507
Net income										5,626	3,844
Balance Sheet [Abstract]
Accounts receivable					19,061					19,061
Prepaid expenses					4,954					4,954
Accounts receivable, long-term					4,571					4,571
Other intangibles, net					(6,827)					(6,827)
Total assets					21,759					21,759
Deferred revenue					(10,848)					(10,848)
Deferred income taxes					7,965					7,965
Retained earnings					24,642					24,642
Liabilities and Equity					$ 21,759					21,759
Adjustments | Software licenses and royalties | Accounting Standards Update 2014-09
Income Statement [Abstract]
Revenue										10,548	9,427
Adjustments | Subscriptions | Accounting Standards Update 2014-09
Income Statement [Abstract]
Revenue										(1,334)	(47)
Adjustments | Software services | Accounting Standards Update 2014-09
Income Statement [Abstract]
Revenue										(6,689)	(3,156)
Adjustments | Maintenance | Accounting Standards Update 2014-09
Income Statement [Abstract]
Revenue										(2,250)	(1,971)
Adjustments | Appraisal services | Accounting Standards Update 2014-09
Income Statement [Abstract]
Revenue										0	0
Adjustments | Hardware and other | Accounting Standards Update 2014-09
Income Statement [Abstract]
Revenue										$ (38)	$ (416)
Minimum | Forecast | Accounting Standards Update 2016-02
Balance Sheet [Abstract]
Lease right-of-use asset												$ 15,500
Lease liability												15,500
Maximum | Forecast | Accounting Standards Update 2016-02
Balance Sheet [Abstract]
Lease right-of-use asset												17,800
Lease liability												$ 17,800

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