v2.4.0.6
Accounts Receivable, Net
 3 Months Ended
Mar. 31, 2012
Accounts Receivable, Net [Abstract]  
Accounts Receivable, Net
2. Accounts Receivable, Net

Accounts receivable balances at March 31, 2012 and December 31, 2011 were as follows (in thousands):

 

                 
    March 31,
2012		     December 31,
2011		  

Trade accounts receivable

   $ 126,418     $ 113,143  

Unbilled revenue

     63,141       33,150  
   

 

 

    

 

 

  

Total accounts receivable

     189,559       146,293  

Allowance for doubtful accounts

     (9,725 )      (9,220 ) 
   

 

 

    

 

 

  

Accounts receivable, net

   $ 179,834     $ 137,073