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Employee Benefit plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Retirement Benefits [Abstract]        
Service cost $ 2,537 $ 1,999 $ 7,815 $ 5,820
Interest cost 750 1,060 1,977 1,721
Expected return on plan assets (1,871) (2,017) (5,315) (4,293)
Amortization of prior service cost 217 175 624 554
Amortization of actuarial losses 167 0 647 0
Net periodic benefit cost $ 1,800 $ 1,217 $ 5,748 $ 3,802