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Receivables (Tables)
9 Months Ended
Sep. 30, 2014
Receivables [Abstract]  
Receivables
The components of receivables were as follows (in thousands):

 
 
September 30,
2014
  
December 31, 2013
 
Billed
 
$
55,377
  
$
68,474
 
Unbilled
  
431,435
   
515,044
 
Total
 
$
486,812
  
$
583,518