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Shareholders' equity - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 11, 2025
period
$ / shares
Mar. 12, 2024
installment
Dec. 31, 2024
USD ($)
$ / shares
shares
Sep. 30, 2024
$ / shares
Jun. 30, 2024
$ / shares
Mar. 31, 2024
$ / shares
Dec. 31, 2024
USD ($)
vote
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
May 22, 2018
USD ($)
$ / shares
Class of Stock [Line Items]                      
Common stock authorized (in shares)     500,000,000       500,000,000        
Common stock, par value (in dollars per share) | $ / shares     $ 0       $ 0     $ 0  
Common stock outstanding (in shares)                   210,478,322  
Common stock issued (in shares)     210,663,057       210,663,057 210,654,969 210,594,545 210,478,322  
Treasury stock (in shares)     2,309,062       2,309,062 2,309,062 2,309,062    
Treasury stock, value | $     $ 19,367,000       $ 19,367,000 $ 19,367,000 $ 19,367,000    
Dividends declared (in dollars per share) | $ / shares     $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.24 $ 0.19 $ 0.15    
Common stock, dividends, number of payment installments | installment   4                  
Payments of dividends | $             $ 50,557,000 $ 40,022,000 $ 31,587,000    
Subsequent event                      
Class of Stock [Line Items]                      
Common stock, dividends, number of payment installments | period 4                    
Class A                      
Class of Stock [Line Items]                      
Common stock authorized (in shares)     420,000,000       420,000,000        
Common stock outstanding (in shares)                   130,478,322  
Common stock issued (in shares)     130,663,057       130,663,057 130,654,969 130,594,545 130,478,322  
Shares issued during the period (in shares)             8,088 60,424 116,223    
Number of votes per share (in votes) | vote             1        
Class A | Subsequent event                      
Class of Stock [Line Items]                      
Dividends declared (in dollars per share) | $ / shares $ 0.24                    
Class A | The repurchase program                      
Class of Stock [Line Items]                      
Common stock, par value (in dollars per share) | $ / shares                     $ 0
Shares authorized, value | $                     $ 60,000,000
Class B                      
Class of Stock [Line Items]                      
Common stock authorized (in shares)     80,000,000       80,000,000        
Common stock outstanding (in shares)                   80,000,000  
Common stock issued (in shares)     80,000,000       80,000,000 80,000,000 80,000,000 80,000,000  
Number of votes per share (in votes) | vote             5        
Class B | Subsequent event                      
Class of Stock [Line Items]                      
Dividends declared (in dollars per share) | $ / shares $ 0.24