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Employee Benefit plans - Net periodic benefit cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Retirement Benefits [Abstract]        
Service cost $ 1,999 $ 2,376 $ 5,820 $ 7,336
Interest cost 1,060 61 1,721 187
Expected return on plan assets (2,017) (1,008) (4,293) (3,114)
Amortization of prior service cost 175 193 554 580
Amortization of actuarial losses 0 89 0 266
Net periodic benefit cost $ 1,217 $ 1,711 $ 3,802 $ 5,255