Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Options
Number of Options, Outstanding, Beginning Balance	3,125,944	2,827,438	1,628,903
Number of Options, Granted		388,822	638,074
Number of Options, Forfeited and Expired	17,203	22,611	701,535
Number of Options, Exercised		(67,705)	(141,074)
Number of Options, Outstanding, Ending Balance	3,108,741	3,125,944	2,827,438
Weighted Average
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance	$ 13.82	$ 13.55	$ 19.13
Weighted Average Option Exercise Price/Share, Granted		16.37	11.90
Weighted Average Option Exercise Price/Share, Forfeited and Expired	15.33	18.14	11.90
Weighted Average Option Exercise Price/Share, Exercised		13.51	11.87
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance	13.81	13.82	13.55
Minimum
Option Exercise Price/Share Range
Exercise Price, Outstanding, Beginning Balance	10.75	10.75	15.65
Exercise Price, Granted		16.37	10.75
Exercise Price, Forfeited and Expired	14.47	14.47	10.75
Exercise Price, Exercised		10.75	10.75
Exercise Price, Outstanding, Ending Balance	10.75	10.75	10.75
Maximum
Option Exercise Price/Share Range
Exercise Price, Outstanding, Beginning Balance	22.49	22.49	24.84
Exercise Price, Granted		16.37	14.62
Exercise Price, Forfeited and Expired	19.64	19.64	14.62
Exercise Price, Exercised		17.29	24.84
Exercise Price, Outstanding, Ending Balance	$ 22.49	$ 22.49	$ 22.49