DigiNotar (Details 2) (DigiNotar [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Summary of loss on disposal
Amount	$ 4,841
Tax	(318)
Net	4,523
Impairment of goodwill [Member]
Summary of loss on disposal
Amount	2,873
Tax	(251)
Net	2,622
Impairment of intangibles [Member]
Summary of loss on disposal
Amount	2,307
Tax	(201)
Net	2,106
Other assets and liabilities [Member]
Summary of loss on disposal
Amount	(1,459)
Tax	204
Net	(1,255)
Provision for doubtful account [Member]
Summary of loss on disposal
Amount	952
Tax	0
Net	952
Professional fees [Member]
Summary of loss on disposal
Amount	1,253
Tax	(110)
Net	1,143
Contingent consideration [Member]
Summary of loss on disposal
Amount	(1,085)
Tax	40
Net	$ (1,045)