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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2018
Commitments And Contingencies [Abstract]      
Standby letters of credit extension period, in years 1 year    
Allowance against letters of credit   $ 2,361  
Letters of credit cancelled $ 250    
Accrued settlement payment     $ 10,000