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Receivables (Tables)
12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Components of Receivables
The components of receivables as of December 31, 2014 and 2013 were as follows (in thousands):

 
 
2014
  
2013
 
Billed
 
$
26,709
  
$
36,703
 
Unbilled
  
32,682
   
41,684
 
Total receivables
 
$
59,391
  
$
78,387