Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Discontinued operations (net of tax) $ 30 $ 21,324 $ (2) $ 4,857 $ (970) $ (1,002) $ (72) $ (46) $ 26,209 $ (2,090) $ (604)
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                 (2,452) (187) 136
Equity in earnings (losses) of AMAK                 702 (986) (901)
Gain (loss) on sale of equity interest                 34,926 (1,473) 0
Loss from discontinued operations before taxes                 33,176 (2,646) (765)
Tax (expense) benefit                 (6,967) 556 161
Discontinued operations (net of tax)                 $ 26,209 $ (2,090) $ (604)