XML 28 R22.htm IDEA: XBRL DOCUMENT v2.4.0.6
Receivables (Tables)
9 Months Ended
Sep. 30, 2012
Receivables [Abstract]  
Receivables
The components of receivables were as follows (in thousands):

   
September 30,
  
December 31,
 
   
2012
  
2011
 
Billed
 $78,936  $77,505 
Unbilled
  416,071   255,962 
Total
 $495,007  $333,467