Stock Compensation (Schedule Of Stock Grant Activity For RSUs) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Beginning Balance, Shares	251,000	286,000	178,000
Granted, Shares	103,000	115,000	196,000
Vested, Shares	(101,000)	(99,000)	(64,000)
Forfeited, Shares	(27,000)	(51,000)	(24,000)
Unvested, Ending Balance, Shares	226,000	251,000	286,000	178,000
Vested and expected to vest, Shares	226,000
Outstanding, Weighted Average Remaining Contractual Term in Years	11 months 4 days	1 year 18 days	1 year 3 months 3 days	1 year 2 months 26 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years	11 months 4 days
Outstanding, Aggregate Intrinsic Value	$ 6,131,000	$ 7,123,000	$ 5,477,000	$ 3,405,000
Vested and expected to vest, Aggregate Intrinsic Value	$ 6,131,000