Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Components of Net Periodic Benefit Cost
Service cost	$ 998	$ 1,200
Interest cost	1,393	1,242
Net loss	210	532
Net periodic pension cost	$ 2,601	$ 2,974
Weighted Average Assumptions for Expense
Discount Rate	3.40%	4.50%
Rate of Compensation Increase	4.40%	4.40%