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Other Income and (Expenses) (Tables)
12 Months Ended
Dec. 31, 2017
Analysis of income and expense [abstract]  
Schedule of other income and (expenses)
 
 
2017

 
2016

Change in closure and decommissioning estimates
 
$
(8,388
)
 
$

Royalties income
 
$
574

 
$
204

Other income
 
2,309

 
1,338

Total
 
$
(5,505
)
 
$
1,542