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Other (expense) income and finance costs - Finance costs (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of other income & finance costs [Line Items] |  |
Capitalized interest paid | $ 0 | $ 3,848,000
Other interest and financing costs | 4,397,000 | 3,196,000
Senior secured notes redemption premium | 6,275,000 | 0
Amortization of discount and transaction costs of senior secured notes due to early redemption | 2,286,000 | 0
Interest expense on lease liabilities | 1,934,000 | 1,828,000
Asset retirement obligation accretion | 1,945,000 | 2,532,000
Total finance costs | 50,943,000 | 49,114,000
Less: Capitalized interest | 0 | 3,848,000
Finance costs | 50,943,000 | 45,266,000
Senior Secured Notes due 2024 |  |
Disclosure of other income & finance costs [Line Items] |  |
Capitalized interest paid | 29,486,000 | 18,087,000
Term loan |  |
Disclosure of other income & finance costs [Line Items] |  |
Capitalized interest paid | 6,380,000 | 6,611,000
Senior notes |  |
Disclosure of other income & finance costs [Line Items] |  |
Capitalized interest paid | 0 | 17,525,000
Senior Notes 1 and Revolving Credit Facility 1 |  |
Disclosure of other income & finance costs [Line Items] |  |
Write-off of unamortized transaction costs of 2012 notes and ARCA (note 16(b)) | 0 | 3,559,000
Redemption option derivative asset |  |
Disclosure of other income & finance costs [Line Items] |  |
Redemption option derivative gain (note 16(a)) | $ (1,760,000) | $ (4,224,000)

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