Unearned Revenues (Summary of Unearned Revenues) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 years	Dec. 31, 2011
Deferred Revenue Arrangement [Line Items]
Unearned revenue	$ 2,942,390	$ 2,708,418
Revenue Recognition, Maintenance Contract Agreements, Contractual Term, Minimum	1 year
Revenue Recognition, Maintenance Contract Agreements, Contractual Term, Maximum	5 years
Revenue Recognition, Maintenance Contract Agreements, Weighted Average Remaining Term	1.9
Unearned license revenues [Member]
Deferred Revenue Arrangement [Line Items]
Unearned revenue	375,644	389,225
Unearned software maintenance revenues [Member]
Deferred Revenue Arrangement [Line Items]
Unearned revenue	2,356,977	2,133,512
Unearned professional services revenues [Member]
Deferred Revenue Arrangement [Line Items]
Unearned revenue	$ 209,769	$ 185,681
Minimum [Member]
Deferred Revenue Arrangement [Line Items]
Ratable component of unearned license revenue	50.10%