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Income taxes - Summary of change in net deferred tax position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Net deferred income tax liability    
Deferred tax liability (asset) at end of period $ 384,361 $ 410,219
Deferred income tax recovery in the statements of operations (28,229) (8,477)
Deferred tax recovery related to discontinued operations 0 (20,039)
Deferred tax expense (recovery) in the consolidated statements of other comprehensive income 2,371 (460)
Deferred tax liability (asset) at beginning of period $ 410,219 $ 439,195