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Employee benefit plans - Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Employee Benefit Plans    
Employer service cost $ 2,522 $ 1,955
Interest cost 64 22
Expected return on plan assets (1,071) (15)
Amortization of prior service cost 194 54
Amortization of actuarial losses 88 288
Net periodic benefit cost $ 1,797 $ 2,304
Location of costs excluding the service component Other income (expense), net Other income (expense), net
Expected contributions $ 6,400