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Contract Receivables (Tables)
 3 Months Ended
Mar. 31, 2017
Contract Receivables [Abstract]  
Components of Contract Receivables
The components of contract receivables are as follows:

(in thousands)
 
March 31,
  
December 31,
 
  
2017
  
2016
 
       
Billed receivables
 
$
5,971
  
$
13,325
 
Recoverable costs and accrued profit not yet billed
  
7,944
   
5,555
 
Allowance for doubtful accounts
  
(18
)
  
(17
)
Total contract receivables, net
 
$
13,897
  
$
18,863