Quarterly report pursuant to Section 13 or 15(d)

GENERAL (Details)

v3.19.2
GENERAL (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
segment
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Noncontrolling Interest [Line Items]      
Number of operating segments | segment 2    
Lease right of use assets, net $ 15,197 $ 17,000 $ 0
Operating lease liability $ 15,197 $ 17,000  
Al Masane Al Kobra (AMAK)      
Noncontrolling Interest [Line Items]      
Percentage of ownership 33.00%    
Pioche Ely Valley Mines, Inc. (PEVM)      
Noncontrolling Interest [Line Items]      
Percentage of ownership 55.00%