Acquisitions (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		3 Months Ended	6 Months Ended							6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 IronKey Systems Inc.	Oct. 04, 2011 IronKey Systems Inc.	Jun. 30, 2012 MXI Security	Jun. 30, 2012 MXI Security	Jun. 04, 2011 MXI Security	Jun. 30, 2012 MXI Security Minimum First Earn-out Payment	Jun. 30, 2012 MXI Security Minimum Second Earn-out Payment	Jun. 30, 2012 MXI Security Maximum First and Second Earn-out Payment [Member]	Jun. 30, 2012 MXI Security Maximum First Earn-out Payment	Jun. 30, 2012 MXI Security Maximum Second Earn-out Payment	Jun. 30, 2012 BeCompliant Corporation (Encryptx)	Feb. 28, 2011 BeCompliant Corporation (Encryptx)
Business Acquisition, Contingent Consideration [Line Items]
Cash paid to acquired entity							$ 19,000,000
Purchase price adjustment						600,000
Contingent consideration minimum range outcome										0.0
Contingent consideration maximum range outcome										45,000,000
Earn-out payments	6,400,000		6,400,000		9,200,000						0	0	25,000,000	25,000,000	25,000,000
Contingent consideration fair value								6,400,000	6,400,000	9,200,000							1,300,000
Contingent consideration adjustment	(2,800,000)	0	(2,800,000)	0				(2,800,000)	(2,800,000)
Contingent consideration payments			$ (1,200,000)	$ 0												$ (700,000)