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, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Software licenses	$ 8,294	$ 8,308	$ 15,736	$ 15,130
Subscriptions	10,553	7,277	20,521	14,241
Software services	21,737	17,992	40,267	34,756
Maintenance	42,060	35,056	81,910	70,568
Appraisal services	5,771	5,987	11,453	12,184
Hardware and other	2,953	2,115	4,204	3,249
Total revenues	91,368	76,735	174,091	150,128
Segment operating income	14,074	10,880	25,474	21,961
Enterprise Software Solutions [Member]
Segment Reporting Information [Line Items]
Software licenses	7,859	7,562	14,688	13,849
Subscriptions	10,297	7,089	20,009	13,926
Software services	19,832	15,625	36,446	29,888
Maintenance	37,985	31,315	73,730	62,947
Hardware and other	1,294	1,018	2,545	2,152
Intercompany	759	463	1,104	870
Total revenues	78,026	63,072	148,522	123,632
Segment operating income	15,831	12,420	29,250	24,768
Appraisal And Tax Software Solutions And Services [Member]
Segment Reporting Information [Line Items]
Software licenses	435	746	1,048	1,281
Subscriptions	256	188	512	315
Software services	1,905	2,367	3,821	4,868
Maintenance	4,075	3,741	8,180	7,621
Appraisal services	5,771	5,987	11,453	12,184
Total revenues	12,442	13,029	25,014	26,269
Segment operating income	2,299	2,407	4,376	5,042
Corporate [Member]
Segment Reporting Information [Line Items]
Hardware and other	1,659	1,097	1,659	1,097
Intercompany	(759)	(463)	(1,104)	(870)
Total revenues	900	634	555	227
Segment operating income	$ (4,056)	$ (3,947)	$ (8,152)	$ (7,849)