Employee Benefit Plans (Summary of 401k Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense associated with the retirement benefit plan	$ 1,023	$ 905	$ 841
Common Stock Shares Held In Benefit Plan	203,989	229,276	228,662