Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Licensing agreement with subscription bundle, term	1 year
Allowance for estimated product returns	$ 1.3	$ 2.1
Weighted Average [Member] | Online Service Agreements [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognition, period for recognition	12 months
Minimum [Member] | Licence Update [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognition, period for recognition	12 months
Maximum [Member] | Licence Update [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognition, period for recognition	24 months