Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Periodic Pension Cost [Abstract]
Interest cost	$ 67	$ 89	$ 202	$ 266
Amortization of net loss	43	34	130	104
Expected return on plan assets	(177)	(171)	(531)	(513)
Net periodic pension cost	(67)	(48)	(199)	(143)
Contributed amount	$ 0	$ 0	$ 0	$ 0