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Income taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax expense (benefit) at statutory income tax rate of 12.5% $ 409,023 $ (125,303) $ 143,490
Foreign rate differential 6,025 13,701 6,279
Valuation allowance (49,149) (32,115) 11,421
Other reconciling items 14,275 (20,380) 1,347
Remeasurement of deferred taxes (43,806) 0 0
Gains not taxable (45,312) 0 0
Total changes (117,967) (38,794) 19,047
Income tax expense (benefit) $ 291,056 $ (164,097) $ 162,537
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income tax expense (benefit) at statutory income tax rate of 12.5% 12.50% 12.50% 12.50%
Foreign rate differential 0.20% (1.30%) 0.60%
Other reconciling items 0.40% 2.00% 0.10%
Remeasurement of deferred taxes (1.30%) 0.00% 0.00%
Gains not taxable (1.40%) 0.00% 0.00%
Valuation allowance (1.50%) 3.20% 1.00%
Total changes (3.60%) 3.90% 1.70%
Income tax expense (benefit) 8.90% 16.40% 14.20%
Non-deductible expenses $ 6,000 $ 8,000 $ 19,000
Withholding taxes 13,000    
Consolidation of group   22,000  
Other items $ 5,000 $ 7,000 1,000
Non-taxable income     $ 19,000