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Employee Benefit plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Retirement Benefits [Abstract]    
Service cost $ 2,621 $ 2,088
Interest cost 441 617
Expected return on plan assets (1,483) (1,540)
Amortization of prior service cost 201 103
Amortization of actuarial losses 87 90
Net periodic benefit cost $ 1,867 $ 1,358