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Income taxes - Summary of Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |  |
Beginning balance | $ 95,554 | $ 97,396 | $ 97,344 | $ 107,583
Charged to income tax expense (recovery) | (10,058) | 676 | (13,846) | (791)
Charged (reduction) to OCI | (5,507) | (6,418) | (3,509) | (15,138)
Ending balance | $ 79,989 | $ 91,654 | $ 79,989 | $ 91,654

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- Definition Deferred Tax Assets, Valuation Allowance + References No definition available. + Details
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- Definition Valuation Allowance Deferred Tax Asset, Charged To Income Tax Expense (Recovery) + References No definition available. + Details
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- Definition Valuation Allowance Deferred Tax Asset, Reduction To Other Comprehensive Income OCI + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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