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Other income & finance costs (Tables)
 12 Months Ended
Dec. 31, 2019
Analysis of income and expense [abstract]  
Other income
(a) Other income
December 31, 2019

 
December 31, 2018

 
 
 
 
 Gain on disposal of assets
$
656

 
$
130

 Interest and other income
3,154

 
16,151

 Income from royalty sale
8,075

 
—

 
$
11,885

 
$
16,281
Finance costs
(b) Finance costs
December 31, 2019

 
December 31, 2018

 
 
 
 
 Asset retirement obligation accretion
$
2,532

 
$
2,038

 Interest on the senior secured notes
18,087

 
—

 Interest on the term loan
6,611

 
—

 Interest on the 2012 notes
17,525

 
36,750

 Write-off of unamortized transaction costs
 of 2012 notes and ARCA (note 16(b))
3,559

 
—

 Interest expense on lease liabilities
1,828

 
407

 Other interest and financing costs
3,196

 
3,192

 Redemption option derivative gain (note 16(a))
(4,224
)
 
—

 Total finance costs
$
49,114

 
$
42,387

 Less: Capitalized interest
3,848

 
36,750

 
$
45,266

 
$
5,637