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Employee Compensation and Benefits Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of employee benefits [Abstract]    
Wages, salaries and bonuses $ 184,225 $ 166,595
Share-based compensation 3,077 3,826
Total employee compensation and benefit expenses 187,302 170,421
Less: Expensed within General and Administrative expenses (14,023) (18,243)
Less: Expensed within Exploration expenses (4,170) (3,922)
Employee compensation and benefits expenses included in production costs (Note 21) $ 169,109 $ 148,256