Annual report pursuant to Section 13 and 15(d)

Receivables

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Receivables
 12 Months Ended
Dec. 31, 2012
Receivables [Abstract]  
Receivables
(2)  Receivables

The components of receivables as of December 31, 2012 and 2011 were as follows (in thousands):

 
  
2012
    
2011
  
Billed
  
$
41,078
    
$
48,382
  
Unbilled (principally December work billed in January)
    
49,543
      
69,186
  
   Total receivables, net
  
$
90,621
    
$
117,568
  

The unbilled balance includes certain costs for work performed at risk but which we believe will be funded by the government totaling approximately $7.1 million and $5.5 million as of December 31, 2012, and 2011, respectively. We expect to invoice substantially all unbilled receivables during 2013.