Employee Benefits (Schedule of net periodic pension (benefit) cost and amounts recognized in other comprehensive income (loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Employee Benefits and Share-based Compensation, Noncash [Abstract]
Interest cost	$ 167	$ 185
Expected return on plan assets	(264)	235
Amortization of unrecognized loss	71	90
Net periodic cost (benefit)	$ (26)	$ 510