Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Operating Real Estate From Consolidated Variable Interest Entities	278,885	278,826
Accumulated depreciation and amortization, consolidated variable interest entities	13,801	12,024
Accumulated Amortization, Deferred Finance Costs	10,881	10,140
Mortgage Payable From Consolidated Variable Interest Entities	204,681	205,299
Preferred Stock, Shares Authorized	15,000,000	15,000,000
Preferred Stock, Par or Stated Value Per Share	0.01	0.01
Preferred Stock, Liquidation Preference Per Share	25	25
Preferred Stock, Shares Issued	399,896	399,896
Preferred Stock, Shares Outstanding	399,896	399,896
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	65,239,183	64,815,446
Common Stock, Shares, Outstanding	65,239,183	64,815,446
5.417% Series 1 Cumulative Convertible Preferred [Member]
Preferred Stock, Dividend Rate, Percentage	5.417%	5.417%