Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands  | 
Sep. 30, 2011  | 
Dec. 31, 2010  | 
|---|---|---|
| Receivables from distributors | ||
| Receivables from distributors | $ 79,934 | $ 67,576 | 
Billed Revenues [Member]  | 
||
| Receivables from distributors | ||
| Receivables from distributors | 42,095 | 30,456 | 
Unbilled Revenues [Member]  | 
||
| Receivables from distributors | ||
| Receivables from distributors | $ 37,839 | $ 37,120 | 
| X | ||||||||||
- Definition Amounts due from OEMs and other distributors. 
  | 
| X | ||||||||||
- Definition Receivables from distributors. 
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