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Summary Of Significant Accounting Policies (Estimated Fair Value And Carrying Value Of Notes) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Estimated Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term notes payable $ 15,664 $ 19,788
Carrying Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term notes payable $ 13,635 $ 16,106