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Contracts in Progress (Tables)
 6 Months Ended
Jun. 30, 2015
Receivables [Abstract]  
Schedule of contracts in progress
Billings in excess of costs and estimated earnings on contracts in progress are summarized in the following table for the periods indicated (in thousands):

 
June 30,
2015
 
December 31,
2014
Costs incurred on uncompleted contracts
$
—

 
$
6,707

Estimated earnings
—

 
1,507

Total revenues
—

 
8,214

Less: billings to date
—

 
8,237

Total
$
—

 
$
(23
)
 
 
 
 
Balance sheet classification:
 
 
 
Billings in excess of costs and estimated earnings on uncompleted contracts
$
—

 
$
23