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Retirement Benefits (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) person	Mar. 31, 2018 USD ($)
Postemployment Benefits [Abstract]
Service cost	$ 174	$ 215
Interest cost	303	274
Expected return on plan assets	(637)	(692)
Amortization of net loss	212	128
Net Periodic Benefit Expense	$ 52	$ (75)
Number of active, vested, terminated and retired persons in the Plan | person	353

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