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Post-employment benefit obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of defined benefit plans [abstract]  
Schedule of Amounts Recognized in Consolidated Statements of Financial Position
The amounts recognized in the consolidated statements financial position are as follows:

 
  
December 31,
    
December 31,
  
 
  
2017
    
2016
  
 
            
Present value of funded obligations
  
$
26,730
    
$
23,910
  
Fair value of plan assets
    
18,112
      
15,794
  
Deficit of funded plans
  
$
8,618
    
$
8,116
  

Schedule of Movements in Defined Benefit Obligations
The movements in the defined benefit obligations are as follows:

 
  
December 31,
    
December 31,
  
 
  
2017
    
2016
  
 
            
Obligations, beginning of year
  
$
23,910
    
$
24,495
  
Current service costs
    
774
      
781
  
Interest costs
    
999
      
1,057
  
Benefits paid
    
(901
)
    
(830
)
Actuarial loss (gain)
    
1,948
      
(1,593
)
Obligations, end of year
  
$
26,730
    
$
23,910
Schedule of Fair Value of Plan Assets
The movements in the fair value of plan assets are as follows:

 
  
December 31,
    
December 31,
  
 
  
2017
    
2016
  
 
            
Assets, beginning of year
  
$
15,794
    
$
15,205
  
Return on assets
    
678
      
648
  
Actuarial gain
    
1,555
      
13
  
Employer contributions
    
986
      
758
  
Benefits paid
    
(901
)
    
(830
)
Assets, end of year
  
$
18,112
    
$
15,794
  
Schedule of Amounts Recognized in Consolidated Statements of Loss and Comprehensive Loss
The amounts recognized in the consolidated statements of loss and comprehensive loss are as follows:

 
  
December 31,
    
December 31,
  
 
  
2017
    
2016
  
 
            
Current service costs and interest costs
            
   included in cost of sales
  
$
1,773
    
$
1,838
  
Schedule of Principal Actuarial Assumptions
The principal actuarial assumptions are as follows:

 
  
December 31,
    
December 31,
  
T
  
2017
    
2016
  
 
            
Discount rate (expense)
    
4.25
%
    
4.25
%
Discount rate (year end disclosures)
    
3.75
%
    
4.25
%
Future salary increases (salaried plan only)
    
5.00
%
    
5.00
%