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Employee benefit plans - Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Employee Benefit Plans        
Service cost $ 1,975 $ 1,523 $ 5,927 $ 4,457
Interest cost 23 49 68 142
Expected return on plan assets (15) (32) (45) (93)
Amortization of prior service cost 54 54 162 161
Amortization of actuarial losses 288 166 864 500
Net periodic benefit cost $ 2,325 $ 1,760 $ 6,976 $ 5,167
Location of costs excluding the service component Other income (expense), net Other income (expense), net Other income (expense), net Other income (expense), net
Expected contributions $ 5,300   $ 5,300