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Significant Accounting Policies (Schedule Of Promotional Allowances) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Promotional Allowances [Line Items]      
Promotional allowances, estimated cost $ 1,549 $ 1,208 $ 1,164
Hotel [Member]      
Promotional Allowances [Line Items]      
Promotional allowances, estimated cost 77 49 47
Food And Beverage [Member]      
Promotional Allowances [Line Items]      
Promotional allowances, estimated cost $ 1,472 $ 1,159 $ 1,117