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Employee Benefit plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Retirement Benefits [Abstract]    
Service cost $ 3,642 $ 2,621
Interest cost 437 441
Expected return on plan assets (1,672) (1,483)
Amortization of prior service cost 194 201
Amortization of actuarial losses 318 87
Net periodic benefit cost $ 2,919 $ 1,867