Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK - Summary of Operating Results (Details)

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INVESTMENT IN AMAK - Summary of Operating Results (Details) - AMAK [Member] - 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]        
Sales $ 19,494 $ 0 $ 33,581 $ 2,256
Cost of sales 16,555 8,901 29,061 12,463
Gross profit (loss) 2,939 (8,901) 4,520 (10,207)
General, administrative and other expenses 3,265 1,971 5,166 4,559
Net Loss (326) (10,872) (646) (14,766)
Depreciation and amortization 8,281 7,609 15,982 10,664
Net income (loss) before depreciation and amortization $ 7,955 $ (3,263) $ 15,336 $ (4,102)