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Revenues, Contract Assets and Contract Liabilities - Schedule of Contract Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Billings in excess of costs $ 3,250 $ 4,393
Advances from customers on uncompleted contracts 11,151 13,832
Total contract liabilities 14,401 18,225
Less: current portion 13,698 16,789
Contract liabilities - non-current $ 703 $ 1,436