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Income taxes - Schedule of Valuation Allowance (Details) - Valuation Allowance of Deferred Tax Assets
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves  
Balance at beginning of period $ 304,672
Additions/(reductions) charged to expenses (10,538)
Additions/(reductions) for acquisitions/dispositions 0
Other additions to (deductions from) reserves 0
Foreign currency translation 3,899
Balance at end of period $ 298,033