Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, shares	(198,900)	(48,400)	(204,245)
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year, shares	198,900	247,300	451,545
Exercised, shares	(198,900)	(48,400)	(204,245)
Outstanding at end of year, shares	0	198,900	247,300
Exercisable at end of year, shares	0	198,900	247,300
Outstanding at beginning of year, Weighted Average Exercise Price	8.95	8.83	9.29
Exercised, Weighted Average Exercise Price	8.95	8.34	9.85
Outstanding at end of year, Weighted Average Exercise Price	0	8.95	8.83
Exercisable at end of year, Weighted Average Exercise Price	0	8.95	8.83