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Accounts Receivable, net
12 Months Ended
Dec. 31, 2011
Accounts Receivable, net  
Accounts Receivable, net

Note 4.  Accounts Receivable, net

        The components of accounts receivable are as follows:

 
  December 31,  
 
  2011   2010  
 
  (in thousands)
 

Trade receivables

  $ 35,482   $ 59,245  

Allowance for doubtful accounts

    (411 )   (1,357 )
           

 

  $ 35,071   $ 57,888