Share-Based Compensation (Summary Of Stock Option Activity) (Details)					3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 1997 Plan [Member]	Mar. 31, 2012 1997 Plan [Member]	Mar. 31, 2013 2005 Plan [Member]	Mar. 31, 2012 2005 Plan [Member]	Mar. 31, 2013 2012 Plan [Member]	Mar. 31, 2012 2012 Plan [Member]
Options outstanding, January 1	516,674	211,675	688,337	509,422
Options granted							0	340,000	360,000	0
Options exercised					0	(19,266)	(55,001)	(141,819)
Options outstanding, March 31,	516,674	211,675	688,337	509,422
Options exercisable, March 31,	323,330		504,994