Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK - Summary of Financial Position (Details)

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INVESTMENT IN AMAK - Summary of Financial Position (Details) - AMAK - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]    
Current assets $ 56,073 $ 44,093
Noncurrent assets 202,640 212,291
Total assets 258,713 256,384
Current liabilities 18,030 17,160
Long term liabilities 80,008 77,366
Stockholders' equity 160,675 161,858
Total liabilities and Shareholders' equity $ 258,713 $ 256,384