Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Operating real estate, accumulated depreciation (in Dollars)	$ 2,092,375	$ 1,955,406
Preferred stock, par value (in Dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized	5,959,100	5,959,100
Preferred stock, shares issued	102,000	102,000
Preferred stock, shares outstanding	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	750,000,000	750,000,000
Common stock, shares issued	413,222,609	411,819,818
Common stock,shares outstanding	413,222,609	411,819,818