Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Amortization of right-of-use assets	$ 12	$ 39
Interest on lease liabilities	1	2
Operating lease cost	8,308	7,719
Variable lease cost	(1,165)	49
Total lease cost	$ 7,156	$ 7,809