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Other Income and (Expenses) (Tables)
 12 Months Ended
Dec. 31, 2018
Analysis of income and expense [abstract]  
Schedule of other income and (expenses)
 
 
2018

 
2017

Change in closure and decommissioning estimates
 
$
(2,968
)
 
$
(8,388
)
Royalties income
 
$
631

 
$
574

Other (loss) income
 
(1,322
)
 
2,309

Total
 
$
(3,659
)
 
$
(5,505
)