Retirement Benefit Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 4
Interest cost	848	604
Expected return on plan assets	(1,058)	(1,384)
Amortization of net (gain)/loss	1,031	182
Net periodic benefit cost	823	(594)
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	204	284
Interest cost	470	278
Amortization of prior service cost	381	420
Amortization of net (gain)/loss	(2)	440
Net periodic benefit cost	$ 1,053	$ 1,422