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Retirement Benefits (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) person	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) person	Sep. 30, 2019 USD ($)
Postemployment Benefits [Abstract]
Service cost	$ 188	$ 174	$ 564	$ 522
Interest cost	270	303	810	909
Expected return on plan assets	(687)	(637)	(2,061)	(1,911)
Amortization of net loss	169	212	507	637
Net Periodic Benefit (Income) Expense	$ (60)	$ 52	$ (180)	$ 157
Number of active, vested, terminated and retired persons in the Plan | person	348		348

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