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Acquisition (Details 2) (USD $)
 1 Months Ended
Jun. 30, 2011
Jun. 03, 2011
Identified intangible assets assumed in the acquisition of CRI    
Total   $ 159,200,000
Purchase price from the business combination was allocated as follows:    
Cash   1,424,000
Accounts receivable   1,140,000
Identified intangible assets   159,200,000
Property and equipment   965,000
Other assets   133,000
Goodwill   96,994,000
Liabilities   (2,613,000)
Total   257,243,000
CRI
    
Purchase price from the business combination was allocated as follows:    
Total   257,200,000
Existing technology
    
Identified intangible assets assumed in the acquisition of CRI    
Total   129,400,000
Estimated Useful Life (in years) 7  
Discount rate (as a percent)   30.00%
Purchase price from the business combination was allocated as follows:    
Identified intangible assets   129,400,000
Customer relationships
    
Identified intangible assets assumed in the acquisition of CRI    
Total   17,300,000
Estimated Useful Life (in years) 7  
Discount rate (as a percent)   26.00%
Purchase price from the business combination was allocated as follows:    
Identified intangible assets   17,300,000
Favorable contracts
    
Identified intangible assets assumed in the acquisition of CRI    
Total   12,200,000
Estimated Useful Life (in years) 2  
Discount rate (as a percent)   9.00%
Purchase price from the business combination was allocated as follows:    
Identified intangible assets   12,200,000
Non-competition agreements
    
Identified intangible assets assumed in the acquisition of CRI    
Total   300,000
Estimated Useful Life (in years) 3  
Discount rate (as a percent)   26.00%
Purchase price from the business combination was allocated as follows:    
Identified intangible assets   $ 300,000
All other purchased intangible assets
    
Identified intangible assets assumed in the acquisition of CRI    
Estimated Useful Life (in years) 7