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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Dec. 31, 2020
Commitments And Contingencies [Abstract]    
Standby letters of credit extension period, in years   1 year
Allowance against letters of credit $ 2,400  
Letters of credit cancelled   $ 250
Accrued settlement payment   $ 2,100