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Fair value measurements - Financial assets and liabilities measured at fair value on recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Assets    
Derivative assets $ 36,913 $ 81,770
Liabilities    
Derivative liabilities 89,457 15,440
Recurring    
Assets    
Derivative assets 36,913 81,770
Investments, at fair value 25,235 75,496
Liabilities    
Derivative liabilities 89,457 15,440
Recurring | Level 1    
Assets    
Derivative assets 0 0
Investments, at fair value 25,235 75,496
Liabilities    
Derivative liabilities 0 0
Recurring | Level 2    
Assets    
Derivative assets 36,913 81,770
Investments, at fair value 0 0
Liabilities    
Derivative liabilities 89,457 15,440
Recurring | Level 3    
Assets    
Derivative assets 0 0
Investments, at fair value 0 0
Liabilities    
Derivative liabilities $ 0 $ 0