Stock Compensation (Schedule Of Shares Available For Grant) (Details)	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Shares	8,400,000
Available for Grant	3,030,000	3,762,000
1996 Discounted Employee Stock Purchase Plan, As Amended [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Shares	1,900,000
Available for Grant	749,000	847,000
2004 Employee Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Shares	2,100,000
Available for Grant	60,000	41,000
2008 Non-Employee Directors Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Shares	300,000
Available for Grant		27,000
2009 Employee Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Shares	4,100,000
Available for Grant	2,221,000	2,847,000