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Material accounting policies - Derivative financial instruments (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
interestRateSwap
Oct. 23, 2024
interestRateSwap
Sep. 30, 2024
interestRateSwap
Dec. 31, 2023
USD ($)
Dec. 29, 2023
interestRateSwap
Dec. 28, 2023
interestRateSwap
Disclosure of detailed information about borrowings [line items]            
Notional Value | $ $ 111,545     $ 93,607    
Number of interest rate swaps | interestRateSwap 4 4     4 12
Number of additional interest rate swaps | interestRateSwap     4      
$150 million facility            
Disclosure of detailed information about borrowings [line items]            
Notional Value | $ $ 150,000