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Retirement Benefits (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) person	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) person	Sep. 30, 2018 USD ($)
Postemployment Benefits [Abstract]
Service cost	$ 174	$ 215	$ 522	$ 645
Interest cost	303	274	909	822
Expected return on plan assets	(637)	(693)	(1,911)	(2,077)
Amortization of net loss	212	129	637	386
Net Periodic Benefit Expense	$ 52	$ (75)	$ 157	$ (224)
Number of active, vested, terminated and retired persons in the Plan | person	353		353

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