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New Accounting Standards Implemented - Schedule of Contract Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 02, 2018	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Billings in excess of costs	$ 5,087	$ 7,516
Advances from customers on uncompleted contracts	14,578	13,000
Total contract liabilities	19,665	20,516
Less: current portion	17,915	18,945
Contract liabilities – non-current	$ 1,750	$ 1,571

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