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Employee benefit plans - Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Employee Benefit Plans        
Service cost $ 1,997 $ 1,477 $ 3,952 $ 2,934
Interest cost 23 47 45 93
Expected return on plan assets (15) (31) (30) (61)
Amortization of prior service cost 54 53 108 107
Amortization of actuarial losses 288 167 576 334
Net periodic benefit cost $ 2,347 $ 1,713 $ 4,651 $ 3,407
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