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Employee Compensation and Benefits Expense (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of employee benefits [Abstract]  
Components of employee compensation and benefits expense
 
 
2018

 
2017

Wages, salaries and bonuses
 
$
181,957

 
$
184,225

Share-based compensation
 
2,957

 
3,077

Total employee compensation and benefit expenses
 
184,914

 
187,302

Less: Expensed within General and Administrative expenses
 
(13,919
)
 
(14,023
)
Less: Expensed within Exploration expenses
 
(3,116
)
 
(4,170
)
Employee compensation and benefits expenses included in production costs
 
$
167,879

 
$
169,109