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Revenues, Contract Assets and Contract Liabilities - Schedule of Contract Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Operating revenues:    
Billings in excess of costs $ 3,101 $ 4,393
Advances from customers on uncompleted contracts 11,476 13,832
Total contract liabilities 14,577 18,225
Less: current portion 14,013 16,789
Contract liabilities - non-current $ 564 $ 1,436