Segment And Related Information (Schedule Of Segment Revenues And Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Software licenses									$ 32,594	$ 34,913	$ 42,131
Subscriptions									31,160	23,298	17,181
Software services									69,617	68,340	80,405
Maintenance									146,498	135,655	124,512
Appraisal services									23,228	20,554	18,740
Hardware and other									6,294	5,868	7,317
Total revenues	82,079	77,184	76,735	73,393	72,439	73,769	72,600	69,820	309,391	288,628	290,286
Depreciation and amortization expense									10,676	10,788	9,497
Segment operating income									50,973	46,458	48,900
Capital expenditures									12,278	3,620	14,167
Segment assets	295,391				264,032				295,391	264,032	270,670
Enterprise Software Solutions [Member]
Segment Reporting Information [Line Items]
Software licenses									30,194	32,757	39,484
Subscriptions									30,400	22,975	16,870
Software services									60,840	58,371	70,041
Maintenance									130,999	120,764	110,404
Hardware and other									5,199	5,727	6,113
Intercompany									2,103	1,978	1,618
Total revenues									259,735	242,572	244,530
Depreciation and amortization expense									8,516	8,903	8,031
Segment operating income									56,856	51,942	54,825
Capital expenditures									11,143	2,960	13,361
Segment assets	448,015				373,432				448,015	373,432	220,135
Appraisal And Tax Software Solutions And Services [Member]
Segment Reporting Information [Line Items]
Software licenses									2,400	2,156	2,647
Subscriptions									760	323	311
Software services									8,777	9,969	10,364
Maintenance									15,499	14,891	14,108
Appraisal services									23,228	20,554	18,740
Hardware and other										6	135
Total revenues									50,664	47,899	46,305
Depreciation and amortization expense									650	683	608
Segment operating income									9,786	8,883	7,763
Capital expenditures									137	350	192
Segment assets	56,389				45,957				56,389	45,957	25,597
Corporate [Member]
Segment Reporting Information [Line Items]
Hardware and other									1,095	135	1,069
Intercompany									(2,103)	(1,978)	(1,618)
Total revenues									(1,008)	(1,843)	(549)
Depreciation and amortization expense									1,510	1,202	858
Segment operating income									(15,669)	(14,367)	(13,688)
Capital expenditures									998	310	614
Segment assets	$ (209,013)				$ (155,357)				$ (209,013)	$ (155,357)	$ 24,938