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Acquisition (Details 2) (USD $)
In Thousands, unless otherwise specified
1 Months Ended
Jun. 30, 2011
year
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
CRI
  
Purchase price from the business combination was allocated as follows:  
Total 257,200
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
All other purchased intangible assets
  
Identified intangible assets assumed in the acquisition of CRI  
Estimated Useful Life (in years)7