Long-Term Debt And Lines of Credit (Debt Outstanding) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total	$ 90,000	$ 89,200
Long-term debt	90,000	89,200
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total	$ 90,000	$ 89,200