CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (Retained earnings:, USD $)	6 Months Ended
	Jun. 30, 2011 Retained earnings	Jun. 30, 2010 Retained earnings
Common stock, per share	$ 0.10	$ 0.10
Series B Preferred Stock
Preferred stock, per share	$ 0.00	$ 8.33
Series C Preferred Stock
Preferred stock, per share	$ 25.00	$ 25.00