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Earnings Per Share - Additional Information (Details)	1 Months Ended
	Jan. 31, 2009 8.5% Convertible perpetual preferred stock	Dec. 31, 2009 6.0% Convertible perpetual preferred stock	Nov. 30, 2010 7.0% Convertible perpetual preferred stock
Earnings Per Share Disclosure [Line Items]
Preferred stock, dividend rate, percentage	8.50%	6.00%	7.00%

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

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