Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK - Equity in the Income or Loss of Equity Method Investment (Details)

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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)