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Retirement Benefits (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) person	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) person	Jun. 30, 2017 USD ($)
Postemployment Benefits [Abstract]
Service cost	$ 215	$ 210	$ 430	$ 420
Interest cost	274	284	548	568
Expected return on plan assets	(692)	(630)	(1,384)	(1,260)
Amortization of net loss	129	169	257	338
Net Periodic Benefit Expense	$ (74)	$ 33	$ (149)	$ 66
Number of active, vested, terminated and retired persons in the Plan | person	353		353

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