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Inventories (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure Of Inventories Explanatory [Abstract]  
Inventories
 
  
 
 
 
 
 
 
December 31,
 
2019
 
 
 
 
 
 
  
 
 
 
 
 
December 31,
 
2018
 
 
 
 
 
 
   
Ore stockpile
  
$
8,592
 
  
$
17,714
 
   
Rough diamonds
  
 
70,190
 
  
 
56,300
 
   
Supplies inventory
  
 
32,990
 
  
 
28,247
 
 
 
 
Total
  
$
                                 111,772
 
  
$
                                 102,261