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ACCOUNTS RECEIVABLE (Tables)
6 Months Ended
Jun. 30, 2015
ACCOUNTS RECEIVABLE [Abstract]  
Schedule of Accounts Receivable
Accounts receivable consist of the following (in thousands):
 
  
June 30,
2015
  
December 31,
2014
 
Contract receivables:
 
  
 
Contracts in progress
 
$
129,326
  
$
105,071
 
Unbilled retentions
  
33,347
   
32,850
 
Trade receivables
  
53,433
   
16,202
 
Other receivables
  
266
   
195
 
Allowance for doubtful accounts
  
(2,345
)
  
(2,760
)
  
$
214,027
  
$
151,558