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Other (expense) income and finance costs (Tables)
 12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
Other (expense) income
(a) Other (expense) income December 31, 2020December 31, 2019
 Interest income and other income (expense)$1,310 $3,154 
 Gain on disposition of Vila Nova (Note 32)
2,451 — 
 Gain (loss) on disposal of assets(5,038)656 
 Income from royalty sale— 8,075 
$(1,277)$11,885 
Finance costs
(b) Finance costsDecember 31, 2020December 31, 2019
 Interest on the senior secured notes$29,486 $18,087 
 Interest on the term loan6,380 6,611 
 Interest on the redeemed 2012 notes— 17,525 
 Other interest and financing costs4,397 3,196 
Senior secured notes redemption premium6,275 — 
Amortization of discount and transaction costs of senior secured notes due to early redemption2,286 — 
 Write-off of unamortized transaction costs
 of 2012 notes and ARCA (Note 15(b))
— 3,559 
 Redemption option derivative gain (Note 15(a))
(1,760)(4,224)
 Interest expense on lease liabilities1,934 1,828 
 Asset retirement obligation accretion1,945 2,532 
 Total finance costs$50,943 $49,114 
 Less: Capitalized interest— 3,848 
$50,943 $45,266