Consolidated Balance Sheets (unaudited) (Parentheticals) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock, Par or Stated Value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	490,000,000	490,000,000
Common Stock, Shares, Outstanding	56,711,202	47,496,732
Series A Cumulative Redeemable Preferred Units Of The Operating Partnership [Member]
Temporary Equity Dividend Rate Percentage	6.25%	6.25%
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares Outstanding of Preferred Stock	499,014
Interest Rate of Preferred Stock	6.25%
Liquidation Preference of Preferred Stock (dollars per share)	$ 25.00
Series B Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Par Value of Preferred Stock	$ 0.01	$ 0.01
Series B Cumulative Redeemable Preferred Stock, Shares Authorized	10,000,000	10,000,000
Shares Outstanding of Preferred Stock	5,800,000	5,800,000
Interest Rate of Preferred Stock	8.375%	8.375%
Liquidation Preference of Preferred Stock (dollars per share)	$ 25	$ 25