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Acquisitions (Details 2) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended
Jun. 30, 2011
Y
Jun. 03, 2011
Identified intangible assets assumed in the acquisition of CRI    
Total   $ 159,200
Purchase price from the business combination was allocated as follows:    
Cash   1,424
Accounts receivable   1,140
Identified intangible assets   159,200
Property and equipment   965
Other assets   133
Goodwill   96,994
Liabilities   (2,613)
Total   257,243
Existing technology
    
Identified intangible assets assumed in the acquisition of CRI    
Total   129,400
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
Customer relationships
    
Identified intangible assets assumed in the acquisition of CRI    
Total   17,300
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
Favorable contracts
    
Identified intangible assets assumed in the acquisition of CRI    
Total   12,200
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
Non-competition agreements
    
Identified intangible assets assumed in the acquisition of CRI    
Total   300
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
The group of purchased intangible assets
    
Identified intangible assets assumed in the acquisition of CRI    
Estimated Useful Life (in years) 7