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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]        
Sales $ 19,877 $ 9,709 $ 53,458 $ 11,965
Cost of sales 20,350 11,016 49,411 23,480
Gross profit (loss) (473) (1,307) 4,047 (11,515)
General, administrative and other expenses 3,917 2,382 9,083 6,942
Net Loss (4,390) (3,689) (5,036) (18,457)
Depreciation and amortization 8,899 6,214 24,881 16,880
Net income (loss) before depreciation and amortization $ 4,509 $ 2,525 $ 19,845 $ (1,577)