Segment And Related Information (Schedule Of Segment Revenues And Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Software licenses	$ 10,090	$ 8,422	$ 18,920	$ 15,985
Subscriptions	13,863	10,553	27,336	20,521
Software services	24,085	21,737	44,546	40,267
Maintenance	46,639	42,060	92,689	81,910
Appraisal services	5,056	5,771	10,647	11,453
Hardware and other	3,355	2,825	4,749	3,955
Total revenues	103,088	91,368	198,887	174,091
Segment operating income	17,000	14,074	33,150	25,474
Enterprise Software Solutions [Member]
Segment Reporting Information [Line Items]
Software licenses	9,621	7,987	17,722	14,937
Subscriptions	13,089	10,297	25,990	20,009
Software services	21,952	19,832	40,693	36,446
Maintenance	42,566	37,985	84,448	73,730
Hardware and other	1,566	1,166	2,960	2,296
Intercompany	748	759	1,336	1,104
Total revenues	89,542	78,026	173,149	148,522
Segment operating income	20,327	15,831	38,155	29,250
Appraisal And Tax Software Solutions And Services [Member]
Segment Reporting Information [Line Items]
Software licenses	469	435	1,198	1,048
Subscriptions	774	256	1,346	512
Software services	2,133	1,905	3,853	3,821
Maintenance	4,073	4,075	8,241	8,180
Appraisal services	5,056	5,771	10,647	11,453
Total revenues	12,505	12,442	25,285	25,014
Segment operating income	2,304	2,299	4,630	4,376
Corporate [Member]
Segment Reporting Information [Line Items]
Hardware and other	1,789	1,659	1,789	1,659
Intercompany	(748)	(759)	(1,336)	(1,104)
Total revenues	1,041	900	453	555
Segment operating income	$ (5,631)	$ (4,056)	$ (9,635)	$ (8,152)