Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Periodic Pension Cost [Abstract]
Interest cost	$ 114	$ 106	$ 227	$ 212
Amortization of net loss	36	26	72	53
Expected return on plan assets	(150)	(174)	(299)	(347)
Net periodic pension cost		(42)		(82)
Contributed amount