Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Amortization of right-of-use assets	$ 49	$ 93	$ 165
Interest on lease liabilities	5	8
Operating lease cost	33,782	33,462
Variable lease cost	(7,068)	(4,445)
Total lease cost	$ 26,768	$ 29,118