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Leases (Summary Of Lease Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Amortization of property and equipment $ 596 $ 643  
Interest expense on finance leases 110 118  
Total finance lease expense 706 761  
Operating lease expense 7,521 [1] 7,145 [1] $ 6,600
Sublease income (399) (905)  
Total lease expense $ 7,828 $ 7,001  
[1] Total rental expense for operating leases was $6.6 million in 2019.