v2.4.0.6
Stockholders' Equity of the REIT (Details1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Schedule of preferred stock    
Total preferred stock $ 582,200 $ 350,000
Shares Outstanding 21,300  
Preferred stock 582,200 350,000
Series L Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 50,000 0
Dividend Rate 6.50%  
Shares Outstanding 2,000  
Preferred stock 50,000  
Preferred Stock, Par or Stated Value Per Share $ 0.01  
Series M Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 57,500 0
Dividend Rate 6.75%  
Shares Outstanding 2,300  
Preferred stock 57,500  
Preferred Stock, Par or Stated Value Per Share $ 0.01  
Series O Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 75,000 0
Dividend Rate 7.00%  
Shares Outstanding 3,000  
Preferred stock 75,000  
Preferred Stock, Par or Stated Value Per Share $ 0.01  
Series P Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 50,000 0
Dividend Rate 6.85%  
Shares Outstanding 2,000  
Preferred stock 50,000  
Preferred Stock, Par or Stated Value Per Share $ 0.01  
Series Q Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 100,000 100,000
Dividend Rate 8.54%  
Shares Outstanding 2,000  
Preferred stock 100,000  
Preferred Stock, Par or Stated Value Per Share $ 0.01  
Series R Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 125,000 125,000
Dividend Rate 6.75%  
Shares Outstanding 5,000  
Preferred stock 125,000  
Preferred Stock, Par or Stated Value Per Share $ 0.01  
Series S Preferred Stock [Member]
    
Schedule of preferred stock    
Total preferred stock 125,000 125,000
Dividend Rate 6.75%  
Shares Outstanding 5,000  
Preferred stock $ 125,000  
Preferred Stock, Par or Stated Value Per Share $ 0.01