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Derivative financial instruments - Income (loss) recorded in comprehensive income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Income tax effect $ 4,409 $ (614) $ 13,521 $ (11,286)
Net (loss) gain on derivatives, net of tax (27,944) 3,315 (86,207) 70,513
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Effective portion of change in fair market value of derivatives designated as accounting cash flow hedges: (34,327) 1,180 (104,085) 76,439
Derivative premium and amortization        
Derivative Instruments, Gain (Loss) [Line Items]        
Effective portion of change in fair market value of derivatives designated as accounting cash flow hedges: $ 1,974 $ 2,749 $ 4,357 $ 5,360