Segment And Related Information (Schedule Of Segment Revenues And Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Software licenses and royalties	$ 10,495	$ 8,973	$ 29,415	$ 24,958
Subscriptions	15,214	11,335	42,550	31,856
Software services	24,860	22,099	69,406	62,366
Maintenance	49,291	44,452	141,980	126,362
Appraisal services	5,207	5,594	15,854	17,047
Hardware and other	1,954	1,392	6,703	5,347
Total revenues	107,021	93,845	305,908	267,936
Segment operating income	19,499	20,240	52,649	45,714
Enterprise Software Solutions [Member]
Segment Reporting Information [Line Items]
Software licenses and royalties	10,126	8,576	27,849	23,513
Subscriptions	14,537	10,960	40,527	30,969
Software services	22,615	20,213	63,308	56,659
Maintenance	45,182	40,282	129,630	114,012
Hardware and other	1,958	1,392	4,917	3,688
Intercompany	686	559	2,023	1,663
Total revenues	95,104	81,982	268,254	230,504
Segment operating income	22,776	21,851	60,930	51,101
Appraisal And Tax Software Solutions And Services [Member]
Segment Reporting Information [Line Items]
Software licenses and royalties	369	397	1,566	1,445
Subscriptions	677	375	2,023	887
Software services	2,245	1,886	6,098	5,707
Maintenance	4,109	4,170	12,350	12,350
Appraisal services	5,207	5,594	15,854	17,047
Total revenues	12,607	12,422	37,891	37,436
Segment operating income	2,441	2,517	7,071	6,893
Corporate [Member]
Segment Reporting Information [Line Items]
Hardware and other	(4)		1,786	1,659
Intercompany	(686)	(559)	(2,023)	(1,663)
Total revenues	(690)	(559)	(237)	(4)
Segment operating income	$ (5,718)	$ (4,128)	$ (15,352)	$ (12,280)