Stock Option And Grant Plan (Stock-Based Compensation Expense) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 32,415	$ 23,088	$ 19,019
Related income tax benefits	(8,509)	(5,552)	(4,254)
Stock-based compensation expense, net of taxes	23,906	17,536	14,765
Basic earnings per share	$ (0.26)	$ (0.19)	$ (0.16)
Diluted earnings per share	$ (0.25)	$ (0.19)	$ (0.16)
Software Licenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	1,478	556	135
Maintenance And Service [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	2,232	1,897	1,541
Selling, General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	15,278	12,501	11,755
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 13,427	$ 8,134	$ 5,588