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Contract Receivables (Tables)
 12 Months Ended
Dec. 31, 2014
Contract Receivables [Abstract]  
Components of Contract Receivables
Contract receivables represent balances due from a broad base of both domestic and international customers. All contract receivables are considered to be collectible within twelve months. Recoverable costs and accrued profit not billed represent costs incurred and associated profit accrued on contracts that will become billable upon future milestones or completion of contracts.  The components of contract receivables are as follows:

(in thousands)
 
December 31,
 
  
2014
  
2013
 
Billed receivables
 
$
10,792
  
$
19,040
 
Recoverable costs and accrued profit not billed
  
5,060
   
5,519
 
Allowance for doubtful accounts
  
(22
)
  
(2
)
Total contract receivables, net
 
$
15,830
  
$
24,557