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

 
 
June 30,
  
December 31,
 
 
 
2013
  
2012
 
Billed
 
$
48,294
  
$
59,496
 
Unbilled
  
512,650
   
439,726
 
Total
 
$
560,944
  
$
499,222