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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]      
Lease expiration month and year 2021-02    
2021 $ 0.1    
Weighted average remaining lease term 30 years 8 months 12 days    
Weighted average discount rate 5.70%    
Rent expense $ 1.8 $ 1.7 $ 1.1