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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2021
Mar. 31, 2020
Sep. 30, 2021
Commitments And Contingencies [Abstract]        
Allowance against letters of credit $ 2,400     $ 1,500
Letters of credit cancelled   $ 636 $ 250