Annual report pursuant to Section 13 and 15(d)

DISCONTINUED OPERATIONS - Discontinued Operations (Details)

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DISCONTINUED OPERATIONS - Discontinued Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Discontinued operations (net of tax) $ 0 $ 26,209 $ (2,090)
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)
Equity in earnings (losses) of AMAK   702 (986)
Gain (loss) on sale of equity interest   34,926 (1,473)
Income (loss) from discontinued operations before taxes   33,176 (2,646)
Tax (expense) benefit   (6,967) 556
Discontinued operations (net of tax)   $ 26,209 $ (2,090)