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Retirement Benefits (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) person	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) person	Jun. 30, 2021 USD ($)
Postemployment Benefits [Abstract]
Service cost	$ 194	$ 220	$ 388	$ 440
Interest cost	263	236	526	472
Expected return on plan assets	(784)	(704)	(1,568)	(1,408)
Amortization of net loss	101	314	203	628
Net Periodic Benefit (Income) Expense	$ (226)	$ 66	$ (451)	$ 132
Number of active, vested, terminated and retired persons in the plan | person	346		346

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