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Retirement Benefits (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) person	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) person	Jun. 30, 2018 USD ($)
Postemployment Benefits [Abstract]
Service cost	$ 174	$ 215	$ 348	$ 430
Interest cost	303	274	606	548
Expected return on plan assets	(637)	(692)	(1,274)	(1,384)
Amortization of net loss	213	129	425	257
Net Periodic Benefit Expense	$ 53	$ (74)	$ 105	$ (149)
Number of active, vested, terminated and retired persons in the Plan | person	353		353

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