Annual report pursuant to Section 13 and 15(d)

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Discontinued Operations (Details)

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INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Discontinued Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Loss from discontinued operations (net of tax) $ 970 $ 1,002 $ 72 $ 46 $ 58 $ 893 $ (180) $ (167) $ 2,090 $ 604 $ 3,503
Discontinued Operations, Disposed of by Sale | Investment In Al Masane Al Kobra Mining Company (AMAK)                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Saudi administration (income) expenses                 187 (136) 173
Equity in losses of AMAK                 986 901 4,261
Other professional expenses                 1,473 0 0
Loss from discontinued operations before taxes                 2,646 765 4,434
Tax benefit                 (556) (161) (931)
Loss from discontinued operations (net of tax)                 $ 2,090 $ 604 $ 3,503