Consolidated Balance Sheets (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Preferred stock, shares authorized	50,000,000	50,000,000
7.0% Series A cumulative convertible perpetual preferred stock, rate	7.00%	7.00%
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	30,289,813	15,663,331
Common stock, shares outstanding	30,289,813	15,663,331
Series A Preferred Stock [Member]
Liquidation preference	$ 50,000,000	$ 50,000,000
Liquidation preference, per share	$ 25.00	$ 25.00
Preferred stock, shares issued	2,000,000	0
Preferred stock, shares outstanding	2,000,000	0