Quarterly report pursuant to Section 13 or 15(d)

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

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INVESTMENT IN AMAK (Held-for-Sale) - Equity in the Income or Loss of Equity Method Investment (Details) - AMAK - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
AMAK Net Loss $ (3,843) $ (4,390) $ (6,318) $ (5,036)  
Percentage of Ownership 33.29% 33.41% 33.29% 33.41% 33.40%
Company's share of loss reported by AMAK $ (1,279) $ (1,467) $ (2,103) $ (1,682)  
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK 337 337 1,010 1,010  
Equity in (losses) earnings of AMAK $ (942) $ (1,130) $ (1,093) $ (672)