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Retirement Benefits (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) person	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) person	Sep. 30, 2020 USD ($)
Postemployment Benefits [Abstract]
Service cost	$ 220	$ 188	$ 660	$ 564
Interest cost	236	270	708	810
Expected return on plan assets	(704)	(687)	(2,112)	(2,061)
Amortization of net loss	314	169	942	507
Net Periodic Benefit Expense (Income)	$ 66	$ (60)	$ 198	$ (180)
Number of active, vested, terminated and retired persons in the Plan | person	347		347

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