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Contracts in Progress (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Receivables [Abstract]      
Costs incurred on uncompleted contracts $ 0 $ 6,707  
Estimated earnings 0 1,507  
Total revenues 0 $ 8,214  
Less: billings to date 0   $ 8,237
Total 0   (23)
Balance sheet classification:      
Billings in excess of costs and estimated earnings on uncompleted contracts $ 0   $ 23