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Summary Of Significant Accounting Policies (Schedule Of Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at Beginning of Period $ 1,371 $ 10,085 $ 1,733
Charges to Operations 0 2,160 10,323
Deductions (583) (10,874) (1,971)
Balance at End of Period $ 788 $ 1,371 $ 10,085