Annual report pursuant to Section 13 and 15(d)

Receivables

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Receivables
 12 Months Ended
Dec. 31, 2011
Receivables [Abstract]  
Receivables
(2)  Receivables

The components of receivables as of December 31, 2011 and 2010 were as follows (in thousands):        
   
2011
    
2010
  
Billed
   $ 48,382     $ 40,494  
Unbilled (principally December work billed in January)
     69,186       116,444  
   Total receivables, net
   $ 117,568     $ 156,938  
 
The unbilled balance includes certain costs for work performed at risk but which we believe will be funded by the government totaling approximately $5.5 million and $4.2 million as of December 31, 2011, and 2010, respectively. We expect to invoice substantially all unbilled receivables during 2012.