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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income from discontinued operations, net of tax $ 0 $ (21,324) $ 0 $ (26,179)
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   (2,605)   (2,490)
Equity in earnings of AMAK   682   455
Gain on sale of equity interest   28,510   35,173
Income from discontinued operations before taxes   26,587   33,138
Tax expense   (5,263)   (6,959)
Income from discontinued operations, net of tax   $ 21,324   $ 26,179