v3.26.1
Employee benefit plans - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Supplemental employee retirement plans        
Defined benefit plan disclosure, net periodic benefit cost [Line Items]        
Net periodic benefit cost (credit) $ 662 $ 716 $ 1,300 $ 1,400