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Receivables (Tables)
9 Months Ended
Sep. 30, 2013
Receivables [Abstract]  
Receivables
The components of receivables were as follows (in thousands):

 
 
September 30,
2013
  
December 31, 2012
 
Billed
 
$
52,396
  
$
59,496
 
Unbilled
  
489,700
   
439,726
 
Total
 
$
542,096
  
$
499,222