Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Operating real estate, accumulated depreciation (in Dollars)	$ 1,864,904	$ 1,745,462
Preferred stock, par value (in Dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized	5,961,200	5,961,200
Preferred stock, shares issued	102,000	102,000
Preferred stock, shares outstanding	102,000	102,000
Aggregate liquidation preference (in Dollars)	$ 975,000	$ 975,000
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	409,656,477	407,782,102
Common stock, shares outstanding	409,656,477	407,782,102