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Contract Receivables (Tables)
 9 Months Ended
Sep. 30, 2013
Contract Receivables [Abstract]  
Components of contract receivables
The components of contract receivables are as follows:

(in thousands)
 
September 30,
  
December 31,
 
 
 
2013
  
2012
 
 
 
  
 
Billed receivables
 
$
6,173
  
$
12,403
 
Recoverable costs and accrued profit not billed
  
14,762
   
11,315
 
Allowance for doubtful accounts
  
(2
)
  
(2
)
Total contract receivables, net
 
$
20,933
  
$
23,716
 
Concentration Risk [Line Items]  
Contract receivable by major customers
The following customers account for more than 10% of the Company's consolidated contract receivables for the indicated periods:

 
September 30,
 
December 31,
 
2013
 
2012
Slovenské elektrárne, a.s.
27.8%
 
17.4%
Shandong Nuclear Power Co. Ltd.
4.8%
 
13.8%