Stock Benefit Plans (Status Of Restricted Stock Awards) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Stock Benefit Plans [Abstract]
Non-vested balance at January 1, 2011 (Shares)	73,900
Granted (Shares)	0
Vested (Shares)	22,200
Forfeited (Shares)	0
Non-vested balance at December 31, 2011 (Shares)	51,700
Non-vested balance at January 1, 2011 (Weighted Average Grant Date Fair Value)	$ 41.41
Granted (Weighted Average Grant Date Fair Value)	$ 0.00
Vested (Weighted Average Grant Date Fair Value)	$ 28.74
Forfeited Granted (Weighted Average Grant Date Fair Value)	$ 0.00
Non-vested balance at December 31, 2011 (Weighted Average Grant Date Fair Value)	$ 46.86