Stock Compensation (Schedule Of Stock Grant Activity For PSUs) (Details) - Performance Stock Units (PSUs) [Member] - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Beginning Balance, Shares	331,000	347,000	147,000
Granted, Shares	215,000	70,000	322,000
Vested, Shares	(60,000)	(55,000)	(87,000)
Forfeited, Shares	(114,000)	(31,000)	(35,000)
Unvested, Ending Balance, Shares	372,000	331,000	347,000	147,000
Vested and expected to vest, Shares	372,000
Outstanding, Weighted Average Remaining Contractual Term in Years	10 months 24 days	1 year 7 months 20 days	2 years 3 months 29 days	8 months 19 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years	10 months 24 days
Outstanding, Aggregate Intrinsic Value	$ 7,579,000	$ 7,805,000	$ 9,400,000	$ 4,179,000
Vested and expected to vest, Aggregate Intrinsic Value	$ 7,579,000