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Leases (Components Of Lease Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease expense $ 1,463 $ 1,484 $ 4,445 $ 4,134
Finance lease expense:        
Amortization of right-of-use assets 31 39 97 120
Interest on lease liabilities 1 3 5 11
Total finance lease expense 32 42 102 131
Variable lease expense $ 554 $ 543 $ 942 $ 1,112