Share-Based Compensation (Schedule Of Performance Vesting Restricted Stock Units Granted) (Details)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Three-year performance period ending December 31,	2014		2013		2012
Vesting shares, target	90,500	[1]	80,000	[1]	55,000	[1]
Vesting shares, maximum	203,625	[1]	120,000	[1]	55,000	[1]
Restricted stock granted					10,000

[1] 2010 grant includes 10,000 shares of restricted stock.