Employee Benefits (Schedule of net periodic pension (benefit) cost and amounts recognized in other comprehensive income (loss)) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Employee Benefits
Interest cost	$ 502	$ 555
Expected return on plan assets	(1,691)	(705)
Amortization of unrecognized loss	1,266	328
Net periodic cost	$ 77	$ 178