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Employee Benefit plans - Net periodic benefit cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Retirement Benefits [Abstract]
Employer service cost	$ 2,376	$ 1,975	$ 7,336	$ 5,927
Interest cost	61	23	187	68
Expected return on plan assets	(1,008)	(15)	(3,114)	(45)
Amortization of prior service cost	193	54	580	162
Amortization of actuarial losses	89	288	266	864
Net periodic benefit cost	$ 1,711	$ 2,325	$ 5,255	$ 6,976

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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