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Accounts Receivable
 9 Months Ended
Sep. 30, 2012
Accounts Receivable

(4) Accounts Receivable

Accounts receivable (in thousands) consisted of the following, as of:

 

     September 30,
2012		     December 31,
2011		  

Billed and billable

    $ 141,422      $ 179,179   

Less: unpaid deferred revenue

      (60,304 )      (78,339 ) 
  

 

 

    

 

 

  

Accounts receivable, gross

      81,118        100,840   

Less: allowance for doubtful accounts

      (5,644 )      (6,117 ) 
  

 

 

    

 

 

  

Accounts receivable, net

    $ 75,474      $ 94,723   
  

 

 

    

 

 

  

The Company offsets its accounts receivable and deferred revenue for any unpaid items included in deferred revenue and advance payments.

The Company maintains an allowance for doubtful accounts which represents its best estimate of probable losses inherent in the accounts receivable balances. The Company evaluates specific accounts when it becomes aware that a customer may not be able to meet its financial obligations due to deterioration of its liquidity or financial viability, credit ratings, or bankruptcy. In addition, the Company periodically adjusts this allowance based upon its review and assessment of the aging of receivables.