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Commitments And Contingencies (Supplemental Balance Sheet Information Related To Operating Leases) (Details)
Dec. 31, 2020
Dec. 31, 2019
Commitments And Contingencies [Abstract]    
Weighted average remaining lease term 6 years 2 months 12 days 6 years 7 months 6 days
Weighted average discount rate 4.55% 5.46%