CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (Retained earnings:, USD $)	9 Months Ended
	Sep. 30, 2011 Retained earnings	Sep. 30, 2010 Retained earnings
Common stock, per share	$ 0.15	$ 0.15
Series B Preferred Stock
Preferred stock, per share	$ 0.00	$ 8.33
Series C Preferred Stock
Preferred stock, per share	$ 37.50	$ 37.50