Geographic And Segment Reporting (Schedule Of Business Segment Information) (Details) (USD $) In Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Licenses	$ 77,632	$ 77,100		$ 144,367		$ 142,081
Services	125,338	109,002		246,760		215,192
Total revenues	202,970	186,102	[1]	391,127	[1]	357,273
Cost of licenses	2,550	1,893		4,334		3,714
Cost of services	22,634	15,636		43,600		30,360
Amortization of purchased technology	5,249	3,965		9,899		8,458
Total cost of revenues	30,433	21,494		57,833		42,532
Gross profit	172,537	164,608		333,294		314,741
Licenses [Member]
Licenses	77,632	77,100		144,367		142,081
Cost of licenses	7,799	5,858		14,233		12,172
Gross profit	69,833	71,242		130,134		129,909
Maintenance Services [Member]
Services	110,276	98,520		218,342		194,288
Cost of services	10,469	7,409		20,480		14,638
Gross profit	99,807	91,111		197,862		179,650
Professional Services [Member]
Services	15,062	10,482		28,418		20,904
Cost of services	12,165	8,227		23,120		15,722
Gross profit	$ 2,897	$ 2,255		$ 5,298		$ 5,182

[1] Includes property and equipment, net and other assets