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Subsequent Event (Details) (USD $)	3 Months Ended		9 Months Ended
Subsequent Event (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loss Contingency, Information about Litigation Matters [Abstract]
Diluted income per common share	$ 0.75	$ 0.72	$ 2.29	$ 2.13
Regular Quarterly Dividend Declared	$ 0.23
Special common stock dividend declared	$ 1.50
Diluted Income Per Share, Restated for 5% Stock Dividend	$ 0.72		$ 2.18

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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