Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease expense	$ 1,463	$ 1,519
Finance lease expense:
Amortization of right-of-use assets	35	40
Interest on lease liabilities	2	4
Total finance lease expense	37	44
Short-term lease expense	35	75
Variable lease expense	$ 177	$ 759