v2.4.0.6
Stockholders' Equity of the REIT and Partners' Capital of the Operating Partnership (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of preferred stock    
Total preferred stock $ 582,200 $ 582,200
Series L Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 49,100 49,100
Preferred shares, liquidation preference per share $ 25 $ 25
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, shares issued 2,000 2,000
Preferred shares, shares outstanding 2,000 2,000
Series M Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 57,500 57,500
Preferred shares, liquidation preference per share $ 25 $ 25
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, shares issued 2,300 2,300
Preferred shares, shares outstanding 2,300 2,300
Series O Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 75,300 75,300
Preferred shares, liquidation preference per share $ 25 $ 25
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, shares issued 3,000 3,000
Preferred shares, shares outstanding 3,000 3,000
Series P Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 50,300 50,300
Preferred shares, liquidation preference per share $ 25 $ 25
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, shares issued 2,000 2,000
Preferred shares, shares outstanding 2,000 2,000
Series Q Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 100,000 100,000
Preferred shares, liquidation preference per share $ 50 $ 50
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, shares issued 2,000 2,000
Preferred shares, shares outstanding 2,000 2,000
Series R Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 125,000 125,000
Preferred shares, liquidation preference per share $ 25 $ 25
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, shares issued 5,000 5,000
Preferred shares, shares outstanding 5,000 5,000
Series S Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock $ 125,000 $ 125,000
Preferred shares, liquidation preference per share $ 25 $ 25
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, shares issued 5,000 5,000
Preferred shares, shares outstanding 5,000 5,000