Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Amortization of right-of-use assets	$ 93	$ 165
Interest on lease liabilities	8	13
Operating lease cost	33,462	31,675
Variable lease cost	(4,445)	1,489
Total lease cost	$ 29,118	$ 33,342