Consolidated Balance Sheets (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Preferred stock, shares authorized	100,000,000
Preferred Stock, Shares Issued	15,200,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	71,172,197	63,244,645
Common Stock, Shares, Outstanding	71,172,197	63,244,645
Series D Convertible Preferred Stock
Percentage of dividend on preferred stock	7.00%	7.00%
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	10,000,000	10,000,000
Preferred Stock, Shares Outstanding	10,000,000	10,000,000
Preferred Stock, Liquidation Preference Per Share	$ 25	$ 25
Series E Cumulative Redeemable Preferred Stock
Percentage of dividend on preferred stock	6.45%	6.45%
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,200,000	5,200,000
Preferred Stock, Shares Issued	5,200,000	5,200,000
Preferred Stock, Shares Outstanding	5,200,000	5,200,000
Preferred Stock, Liquidation Preference Per Share	$ 25	$ 25