COSTS AND ESTIMATED PROFITS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Schedule of costs and estimated earnings on uncompleted contracts [Abstract]
Costs incurred on uncompleted contracts	$ 52,506	$ 53,595
Estimated profits, thereon	8,932	6,847
Total	61,438	60,442
Less: billings to date	34,743	38,662
Net	26,695	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	33,898	32,514
Billings in excess of costs and estimated profits	(7,201)	(10,696)
Translation adjustment	(2)	(38)
Net	26,695	$ 21,780
Balances previously classified as contract liabilities at the beginning of the period that have shipped	$ 10,500