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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
(Income) loss from discontinued operations, net of tax $ 0 $ 2 $ 0 $ (4,855)
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 (income) expenses   (97)   (114)
Equity in (earnings) losses of AMAK   (306)   226
Gain on sale of equity interest   0   (6,663)
Income from discontinued operations before taxes   (403)   (6,551)
Tax expense   405   1,696
(Income) loss from discontinued operations, net of tax   $ 2   $ (4,855)