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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 distributors42,09530,456
Unbilled Revenues [Member]
  
Receivables from distributors  
Receivables from distributors$ 37,839$ 37,120