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Fair value measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Assets    
Derivative assets $ 81,770 $ 130,614
Liabilities    
Derivative liabilities 15,440 80,840
Recurring    
Assets    
Derivative assets 81,770 130,614
Investments, at fair value 75,496 84,130
Liabilities    
Derivative liabilities 15,440 80,840
Recurring | Level 1    
Assets    
Derivative assets 0 0
Investments, at fair value 75,496 72,540
Liabilities    
Derivative liabilities 0 0
Recurring | Level 2    
Assets    
Derivative assets 81,770 130,614
Investments, at fair value 0 0
Liabilities    
Derivative liabilities 15,440 80,840
Recurring | Level 3    
Assets    
Derivative assets 0 0
Investments, at fair value 0 11,590
Liabilities    
Derivative liabilities $ 0 $ 0