CONTINGENCIES AND COMMITMENTS (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Loss related to cost overruns and re-work	$ 22,500	$ 34,500
Estimated liquidated damages	$ 233
Maximum
Loss Contingencies [Line Items]
Estimated liquidated damages		$ 11,200