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Leases (Components Of Lease Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Operating lease expense $ 1,519 $ 1,260 $ 2,982 $ 2,651
Finance lease expense:        
Amortization of right-of-use assets 31 38 67 79
Interest on lease liabilities 2 4 4 8
Total finance lease expense 33 42 71 87
Short-term lease expense 35 68 70 147
Variable lease expense $ 211 $ (151) $ 388 $ 568