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Receivables (Tables)
3 Months Ended
Mar. 31, 2014
Receivables [Abstract]  
Receivables
The components of receivables were as follows (in thousands):

 
 
March 31,
2014
  
December 31,
2013
 
Billed
 
$
53,886
  
$
68,474
 
Unbilled
  
399,999
   
515,044
 
Total
 
$
453,885
  
$
583,518