Share-Based Compensation (Summary Of Stock Option Activity) (Details)					9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Sep. 30, 2012 1997 Plan	Sep. 30, 2011 1997 Plan	Sep. 30, 2012 2005 Plan	Sep. 30, 2011 2005 Plan
Options outstanding, January 1	341,675	509,422	565,256	384,507
Options granted							340,000	340,000
Options forfeited							0	(3,334)
Options exercised					(19,266)	(15,000)	(488,481)	(140,917)
Options outstanding, March 31,	341,675	509,422	565,256	384,507
Options exercisable March 31,	165,000		401,664