Share-Based Compensation (Summary Of Stock Option Activity) (Details)					6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2012 1997 Plan	Jun. 30, 2011 1997 Plan	Jun. 30, 2012 2005 Plan	Jun. 30, 2011 2005 Plan
Options outstanding, January 1	498,338	509,422	677,589	384,507
Options granted							340,000	340,000
Options forfeited							0	(3,334)
Options exercised					(19,266)	(15,000)	(331,818)	(28,584)
Options outstanding, March 31,	498,338	509,422	677,589	384,507
Options exercisable March 31,	321,663		488,996