Stockholders' Equity of REIT and Partners' Capital of the Operating Partnership (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010
Series L Preferred Stock	$ 49,100,000
Series M Preferred Stock	57,500,000
Series O Preferred Stock	75,300,000
Series P Preferred Stock	50,300,000
Series Q Preferred Stock	100,000,000	100,000,000
Series R Preferred Stock	125,000,000	125,000,000
Series S Preferred Stock	$ 125,000,000	$ 125,000,000