Acquisitions (Details Textual) (USD $) In Millions, except Share data in Thousands, unless otherwise specified		0 Months Ended	1 Months Ended		1 Months Ended		1 Months Ended
	Apr. 01, 2012	Jan. 10, 2011 Epicentre [Member] years	Jan. 31, 2011 Developed Technology Rights [Member] Epicentre [Member] years	Jan. 10, 2011 Developed Technology Rights [Member] Epicentre [Member]	Jan. 31, 2011 Trade Names [Member] Epicentre [Member] years	Jan. 10, 2011 Trade Names [Member] Epicentre [Member]	Jan. 31, 2011 Customer Relationships [Member] Epicentre [Member] years	Jan. 10, 2011 Customer Relationships [Member] Epicentre [Member]
Acquisition Details (Textual) [Abstract]
Business acquisition total consideration		$ 71.4
Business acquisition net cash consideration		59.4
Fair value of contingent consideration to be settled in stock		4.6
Fair value of contingent consideration to be settled in cash		7.4
Contingent consideration payments, maximum		15.0
Shares issued to shareholders in connection with business acquisition (in shares)		229
Portion of shares issued included in purchase price		33.33%
Fair value of shares as contingent compensation for post acquisition service		10.1
Fair value of shares as contingent compensation for post acquisition service period of recognition (in years)		2
Discount rate for assessment of the acquisition date fair value		21.00%
Total consideration to tangible assets, net of liabilities		0.9
Consideration to identified intangible assets		26.9		23.3		2.5		1.1
Weighted average useful life of identified intangible assets (in years)			9		10		3
Excess Consideration goodwill		43.6
Remaining potential payment of contingent consideration related to prior year acquisitions	$ 1.4