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Shareholders' contributions - Narrative (Details)
12 Months Ended 99 Months Ended
Apr. 20, 2023
USD ($)
Nov. 17, 2022
USD ($)
$ / shares
May 17, 2022
USD ($)
$ / shares
Apr. 20, 2022
USD ($)
installment
$ / shares
shares
Dec. 31, 2022
USD ($)
vote
$ / shares
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
shares
Apr. 19, 2023
installment
Sep. 24, 2013
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Par value per share (USD per share) | $ / shares         $ 1.5          
Number of votes per share | vote         1          
Share capital         $ 167,073,000 $ 183,573,000   $ 183,573,000    
Treasury shares (in shares)         4,792,000 16,909,000   $ 16,909,000    
Authorized proportion of outstanding stock (as a percent)                   5.00%
Purchase of treasury shares         $ 36,844,000 66,463,000 $ 4,365,000      
Treasury stock (shares) | shares         3,190,597          
Number of payment installments | installment       2            
Dividends recognized as distributions to owners   $ 17,500,000 $ 17,500,000     298,000 2,460,000      
Dividends recognized as distributions to owners (USD per share) | $ / shares   $ 0.1602 $ 0.1572              
Decision of the Extraordinary General Shareholders’ meeting                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Reduction of issued capital       $ 16,500,000            
Cancellation of treasury shares (in shares) | shares       11,000,000            
Treasury shares, nominal value (USD per share) | $ / shares       $ 1.50            
Share capital       $ 167,072,722.5            
Number of shares issued (in shares) | shares       111,381,815            
Treasury shares (in shares)       $ 52,254            
Annual Dividend Proposal                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Dividend payables       $ 35,000,000            
Number of payment installments | installment                 2  
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners $ 35,000,000                  
Share Repurchase Program                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Stock repurchased under program (shares) | shares               21,948,707    
Employee stock options exercised (shares) | shares               7,862,922    
Purchase of treasury shares         $ 36,800,000 $ 66,500,000 $ 4,400,000