Stock Compensation (Schedule Of Stock Grant Activity For RSUs) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Aggregate Intrinsic Value	$ 8,021,000	$ 8,274,000	$ 1,225,000.0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Beginning Balance, Shares	129,000	120,000	97,000
Granted, Shares	5,000	73,000	64,000
Vested, Shares	(52,000)	(54,000)	(37,000)
Forfeited, Shares	(21,000)	(10,000)	(4,000)
Unvested, Ending Balance, Shares	61,000	129,000	120,000	97,000
Vested and expected to vest, Shares	57,000
Outstanding, Weighted Average Remaining Contractual Term in Years	1 year 2 months 16 days	1 year 6 months 22 days	1 year 6 months 15 days	1 year 7 months 28 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years	1 year 2 months 16 days
Outstanding, Aggregate Intrinsic Value	687,000	1,425,000	747,000	466,000
Vested and expected to vest, Aggregate Intrinsic Value	$ 651,000