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Provisions (Tables)
 12 Months Ended
Dec. 31, 2017
Provisions [abstract]  
Disclosure of provisions
 
 
Closure and
Decommissioning
 
Litigation
 
Total

December 31, 2015
 
$
50,453

 
$
4,418

 
$
54,871

Revisions in estimates and obligations incurred
 
6,875

 
—

 
6,875

Charged (credited) to earnings:
 
 

 
 

 
 

-new provisions
 
—

 
347

 
347

-change in estimate
 
—

 
(104
)
 
(104
)
-exchange gains on provisions
 
—

 
(32
)
 
(32
)
Charged in the year
 
—

 
(297
)
 
(297
)
Reclamation expenditures
 
(6,080
)
 
—

 
(6,080
)
Accretion expense (Note 23)
 
4,363

 
—

 
4,363

December 31, 2016
 
$
55,611

 
$
4,332

 
$
59,943

Revisions in estimates and obligations incurred
 
12,561

 
—

 
12,561

Charged (credited) to earnings:
 
 
 
 
 
 

-new provisions
 
—

 
767

 
767

-change in estimate
 
—

 
(228
)
 
(228
)
-exchange gains on provisions
 
—

 
93

 
93

Charged in the year
 
—

 
(867
)
 
(867
)
Reclamation expenditures
 
(8,749
)
 
—

 
(8,749
)
Accretion expense (Note 23)
 
5,973

 
—

 
5,973

December 31, 2017
 
$
65,396

 
$
4,097

 
$
69,493

 
Maturity analysis of total provisions:
 
December 31,
2017

 
December 31,
2016

Current
 
$
8,245

 
$
8,499

Non-Current
 
61,248

 
51,444

 
 
$
69,493

 
$
59,943