Stock Compensation (Schedule Of Stock Grant Activity For PSUs) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Aggregate Intrinsic Value	$ 5,992,000	$ 8,021,000	$ 8,274,000	$ 1,225,000
Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Beginning Balance, Shares	257,000	236,000
Granted, Shares	125,000	185,000
Vested, Shares	(139,000)	(143,000)
Forfeited, Shares	(108,000)	(21,000)
Unvested, Ending Balance, Shares	135,000	257,000	236,000
Vested and expected to vest, Shares	128,000
Outstanding, Weighted Average Remaining Contractual Term in Years	8 months 27 days	8 months 23 days	9 months 22 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years	8 months 12 days
Outstanding, Aggregate Intrinsic Value	$ 1,455,000	$ 2,907,000	$ 2,612,000
Vested and expected to vest, Aggregate Intrinsic Value	$ 1,381,000