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Equity Offering (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Aug. 17, 2010	Aug. 11, 2009
Equity Offering [Abstract]
Underwritten public offering shares, common shares	13,340,000	9,435,000
Underwritten public offering, price per share	$ 5.67	$ 5.30
Net proceeds of the stock offering	$ 71.1	$ 47.5

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

Number of new stock issued during the period.