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Acquisitions (Details Textual) (USD $)
Share data in Thousands, unless otherwise specified
0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Sep. 30, 2012
Jan. 10, 2011
Epicentre [Member]
years
Sep. 19, 2012
BlueGnome [Member]
Jan. 31, 2011
Customer Relationships [Member]
Epicentre [Member]
Jan. 10, 2011
Customer Relationships [Member]
Epicentre [Member]
Sep. 19, 2012
Customer Relationships [Member]
BlueGnome [Member]
Jan. 31, 2011
Developed Technology Rights [Member]
Epicentre [Member]
Jan. 10, 2011
Developed Technology Rights [Member]
Epicentre [Member]
Sep. 19, 2012
Developed Technology Rights [Member]
BlueGnome [Member]
Jan. 31, 2011
Trade Names [Member]
Epicentre [Member]
Jan. 10, 2011
Trade Names [Member]
Epicentre [Member]
Sep. 19, 2012
Trade Names [Member]
BlueGnome [Member]
Acquisition Details (Textual) [Abstract]                        
Business acquisition total consideration   $ 71,400,000 $ 95,500,000                  
Business acquisition net cash consideration   59,400,000 88,000,000                  
Fair value of contingent consideration to be settled in stock   4,600,000                    
Fair value of contingent consideration to be settled in cash   7,400,000 7,500,000                  
Contingent consideration payments, maximum   15,000,000 20,000,000                  
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   10,100,000                    
Recognition period of fair value of shares as contingent compensation for post acquisition service (in years)   2                    
Discount rate for assessment of the acquisition date fair value   21.00% 30.00%                  
Fair value of contingent compensation     20,000,000                  
Total consideration to tangible assets, net of liabilities   900,000 9,800,000                  
Consideration to identified intangible assets   26,900,000 49,200,000   1,100,000 17,100,000   23,300,000 25,000,000   2,500,000 7,100,000
Weighted average useful life of identified intangible assets (in years)       3 years   7 years 9 years   7 years 10 years   10 years
Deferred tax liabilities related to intangible ssets     11,800,000                  
Excess consideration recorded as goodwill   43,600,000 48,300,000                  
Remaining potential payment of contingent compensation related to acquisitions prior to 2011 $ 1,400,000