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Retirement Benefits (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) person	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) person	Jun. 30, 2020 USD ($)
Postemployment Benefits [Abstract]
Service cost	$ 220	$ 188	$ 440	$ 376
Interest cost	236	270	472	540
Expected return on plan assets	(704)	(687)	(1,408)	(1,374)
Amortization of net loss	314	169	628	338
Net Periodic Benefit Expense (Income)	$ 66	$ (60)	$ 132	$ (120)
Number of active, vested, terminated and retired persons in the Plan | person	347		347

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