Share-Based Compensation (Summary Of Stock Option Activity) (Details)					3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2012 1997 Plan	Mar. 31, 2011 1997 Plan	Mar. 31, 2012 2005 Plan	Mar. 31, 2011 2005 Plan
Options outstanding, January 1	688,337	509,422	677,589	384,507
Options granted							340,000	340,000
Options forfeited							0	3,334
Options exercised					19,266	15,000	141,819	28,584
Options outstanding, March 31,	688,337	509,422	677,589	384,507
Options exercisable March 31,	504,994		503,996