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Debt
9 Months Ended
Sep. 30, 2014
Debt [Abstract]  
Debt
      Interest Rate at Balance at 
 (Amounts in thousands)September 30, 2014 September 30, 2014 December 31, 2013 
 Mortgages Payable:         
  Fixed rate 4.47% $ 7,723,956 $ 7,563,133 
  Variable rate 2.29%   1,549,256   768,860 
       4.11% $ 9,273,212 $ 8,331,993 
               
 Unsecured Debt:         
  Senior unsecured notes 4.88% $ 1,791,987 $ 1,350,855 
  Revolving credit facility debt 1.30%   88,138   295,870 
       4.71% $ 1,880,125 $ 1,646,725