COSTS AND ESTIMATED PROFITS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Schedule of costs and estimated earnings on uncompleted contracts [Abstract]
Costs incurred on uncompleted contracts	$ 71,489	$ 53,595
Estimated profits, thereon	8,587	6,847
Total	80,076	60,442
Less: billings to date	50,547	38,662
Net	29,529	21,780
Schedule of Costs and Estimated Earnings on Uncompleted Contracts Included in Condensed Consolidated Balance Sheets [Abstract]
Costs and estimated profits in excess of billings	35,484	32,514
Billings in excess of costs and estimated profits	(5,968)	(10,696)
Translation adjustment	13	(38)
Net	29,529	$ 21,780
Balances previously classified as contract liabilities at the beginning of the period that have shipped	$ 8,900