| 
           Accounts Receivable, net (Details 1) (USD $) 
        In Thousands, unless otherwise specified  | 
        
           Mar. 31, 2012 
         | 
        
           Dec. 31, 2011 
         | 
      
|---|---|---|
| Receivables from distributors | ||
| Total | $ 96,037 | $ 84,817 | 
| 
           Billed Revenues [Member] 
         | 
        ||
| Receivables from distributors | ||
| Total | 52,426 | 44,618 | 
| 
           Unbilled Revenues [Member] 
         | 
        ||
| Receivables from distributors | ||
| Total | $ 43,611 | $ 40,199 | 
| X | ||||||||||
| 
             
- Definition 
          Amounts due from OEMs and other distributors. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
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