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GOODWILL (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Goodwill    
Goodwill $ 4,373 $ 136,399
Impairments of goodwill 132,026  
Hamilton mining complex    
Goodwill    
Goodwill   $ 132,000
Impairments of goodwill $ 132,000