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
Mar. 31, 2020
Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
(Income) loss from discontinued operations (net of tax) $ 4,857 $ (59)
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 (17) 16
Equity in losses of AMAK 532 59
Gain on sale of equity interest (6,663) 0
(Income) loss from discontinued operations before taxes 6,148 (75)
Tax expense (benefit) 1,291 (16)
(Income) loss from discontinued operations (net of tax) $ 4,857 $ (59)