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Revenue (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of disaggregation of revenue from contracts with customers [abstract]  
Schedule of Disaggregation of Revenue
The following is a disaggregation of revenue categorized by commodities sold:

 
  
Three-month
    
Three-month
    
Nine-month
    
Nine-month
  
 
  
period ended
    
period ended
    
period ended
    
period ended
  
 
  
September 30,
    
September 30,
    
September 30,
    
September 30,
  
 
  
2018
    
2017
    
2018
    
2017
  
 
                        
Silver
                        
Provisional sales revenue
  
$
4,563
    
$
5,813
    
$
16,501
    
$
23,986
  
Derivative pricing adjustments
    
(298
)
    
151
      
(343
)
    
1,466
  
 
    
4,265
      
5,964
      
16,158
      
25,452
  
Zinc
                                
Provisional sales revenue
  
$
8,941
    
$
1,406
    
$
32,104
    
$
7,655
  
Derivative pricing adjustments
    
(2,494
)
    
330
      
(2,726
)
    
544
  
 
    
6,447
      
1,736
      
29,378
      
8,199
  
Lead
                                
Provisional sales revenue
  
$
6,785
    
$
5,475
    
$
22,641
    
$
18,461
  
Derivative pricing adjustments
    
(489
)
    
213
      
(440
)
    
312
  
 
    
6,296
      
5,688
      
22,201
      
18,773
  
Other by-products
                                
Provisional sales revenue
  
$
133
    
$
300
    
$
360
    
$
1,927
  
Derivative pricing adjustments
    
(12
)
    
1
      
3
      
2
  
 
    
121
      
301
      
363
      
1,929
  
 
                                
Gross revenue
  
$
17,129
    
$
13,689
    
$
68,100
    
$
54,353
  
Treatment and selling costs
    
(5,395
)
    
(3,875
)
    
(18,632
)
    
(12,119
)
 
  
$
11,734
    
$
9,814
    
$
49,468
    
$
42,234