Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Series A cumulative redeemable preferred, liquidation preference	$ 25.00	$ 25.00
Series A cumulative redeemable preferred, shares issued	3,204,900	3,204,900
Series A cumulative redeemable preferred, shares outstanding	3,204,900	3,204,900
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	66,275,535	57,471,268
Common stock, shares outstanding	66,275,535	57,471,268