Summary of Significant Accounting Policies (Schedule Of Performance Vesting Restricted Stock Units Granted) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Three-year performance period ending December 31,	2015	2014	2013
Vesting shares, target (in shares)	84,500	89,000	80,000
Vesting shares, maximum (in shares)	190,125	200,250	120,000