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Income taxes - Summary of Valuation Allowance for Deferred Tax Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
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