v3.26.1
Fair value measurements - Schedule of Fair Value Amounts of Derivative Instruments and their Effect on Consolidated Income Statements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Recognized in Income on Derivatives (pre-tax) $ 3,323 $ 409 $ 7,252 $ (729)
Commodity contracts | Income Statement Location [Axis]: us-gaap:PrincipalTransactionsRevenue | Futures        
Derivative Instruments, Gain (Loss) [Line Items]        
Recognized in Income on Derivatives (pre-tax) 3,309 393 7,238 (745)
Other contracts | Income Statement Location [Axis]: us-gaap:LaborAndRelatedExpense | Foreign exchange forward contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Recognized in Income on Derivatives (pre-tax) (22)   (20)  
Other contracts | Income Statement Location [Axis]: us-gaap:PrincipalTransactionsRevenue | TBAs        
Derivative Instruments, Gain (Loss) [Line Items]        
Recognized in Income on Derivatives (pre-tax) $ 36 $ 16 $ 34 $ 16