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Retirement Benefits (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) person	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) person	Sep. 30, 2017 USD ($)
Postemployment Benefits [Abstract]
Service cost	$ 215	$ 210	$ 645	$ 630
Interest cost	274	284	822	852
Expected return on plan assets	(693)	(630)	(2,077)	(1,890)
Amortization of net loss	129	169	386	507
Net Periodic Benefit Expense	$ (75)	$ 33	$ (224)	$ 99
Number of active, vested, terminated and retired persons in the Plan | person	353		353

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