Employee Benefit Plans (Restricted Shares Activity And Related Information) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 44.47	$ 37.74
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	160,531	125,919	142,469	116,711
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	24,262	11,633
Restricted Awards, Forfeited/Vested	(6,200)	(2,425)