INVESTMENT IN AMAK - Equity in the Income or Loss of Equity Method Investment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Equity in loss of AMAK	$ (1,130)	$ (897)	$ (672)	$ (5,161)
AMAK [Member]
Schedule of Equity Method Investments [Line Items]
AMAK Net Loss	(4,390)	(3,689)	(5,036)	(18,457)
Company's share of loss reported by AMAK	(1,467)	(1,234)	(1,682)	(6,172)
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK	337	337	1,010	1,011
Equity in loss of AMAK	$ (1,130)	$ (897)	$ (672)	$ (5,161)