Accounting For Stock Based Compensation (Schedule of Share-based Compensation, Restricted Stock Units and Phantom Stock, Activity) (Details) (Phantom Stock and Restricted Stock Units [Member], USD $)	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2012
Phantom Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Unvested Shares	65,270	52,956	62,886
Granted, Shares		39,870
Vested, Shares	(2,384)	(27,556)
Ending Balance, Unvested Shares	62,886	65,270	62,886
Beginning of Period, Weighted Average Grant Date Fair Value	$ 26.67	$ 31.67	$ 26.72
Granted, Weighted Average Grant Date Fair Value		$ 21.07
Vested, Weighted Average Grant Date Fair Value	$ 25.27	$ 28.19
End of Period, Weighted Average Grant Date Fair Value	$ 26.72	$ 26.67	$ 26.72