Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK (Held-for-Sale) - Discontinued Operations (Details)

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INVESTMENT IN AMAK (Held-for-Sale) - Discontinued Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
(Income) loss from discontinued operations (net of tax) $ 2 $ 103 $ (4,855) $ 162
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) 39 (114) 55
Equity in (earnings) losses of AMAK (306) 91 226 150
Gain on sale of equity interest 0 0 (6,663) 0
(Income) loss from discontinued operations before taxes (403) 130 (6,551) 205
Tax expense (benefit) 405 (27) 1,696 (43)
(Income) loss from discontinued operations (net of tax) $ 2 $ 103 $ (4,855) $ 162