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Long-Term Debt (Schedule Of Future Debt Payments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Long-Term Debt [Line Items]    
2020  
2021  
2022  
Total long-term debt $ 124
Bank Credit Facility [Member]    
Long-Term Debt [Line Items]    
2020  
2021  
2022  
Total long-term debt