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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]        
Equity in earnings (loss) of AMAK $ 228 $ (3,298) $ 458 $ (4,264)
AMAK [Member]        
Schedule of Equity Method Investments [Line Items]        
AMAK Net Loss (326) (10,872) (646) (14,766)
Company's share of loss reported by AMAK (109) (3,635) (216) (4,938)
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK 337 337 674 674
Equity in earnings (loss) of AMAK $ 228 $ (3,298) $ 458 $ (4,264)