Geographic And Segment Reporting (Reportable Segment Data) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 212,196	$ 188,157
Cost of revenues	33,853	27,399
Gross profit	178,343	160,758
Licenses [Member]
Segment Reporting Information [Line Items]
Revenues	69,983	66,735
Cost of revenues	9,851	6,434
Gross profit	60,132	60,301
Maintenance Services [Member]
Segment Reporting Information [Line Items]
Revenues	126,820	108,066
Cost of revenues	11,820	10,011
Gross profit	115,000	98,055
Professional Services [Member]
Segment Reporting Information [Line Items]
Revenues	15,393	13,356
Cost of revenues	12,182	10,954
Gross profit	$ 3,211	$ 2,402