Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Operating real estate, accumulated depreciation (in Dollars)	$ 1,835,280	$ 1,745,462
Preferred stock, par value (in Dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in Shares)	5,961,200	5,961,200
Preferred stock, shares issued (in Shares)	102,000	102,000
Preferred stock, shares outstanding (in Shares)	102,000	102,000
Preferred stock, 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 (in Shares)	750,000,000	750,000,000
Common stock, shares issued (in Shares)	409,616,877	407,782,102
Common stock, shares outstanding (in Shares)	409,616,877	407,782,102