Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Discontinued Operations (Details)

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INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Discontinued Operations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income from discontinued operations, net of tax $ 0 $ (4,857)
Investment In Al Masane Al Kobra Mining Company (AMAK) | Discontinued Operations, Disposed of by Sale    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Saudi administration and transaction expenses 0 17
Equity in losses of AMAK 0 (532)
Gain on sale of equity interest 0 6,663
Income from discontinued operations before taxes 0 6,148
Tax expense 0 (1,291)
Income from discontinued operations, net of tax $ 0 $ 4,857