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Debt (Tables)
12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Schedule of Debt [Table Text Block]
 (Amounts in thousands)Weighted Average       
      Interest Rate at  Balance at December 31, 
      December 31, 2015  2015  2014 
 Mortgages Payable:         
  Fixed rate 4.29% $ 6,356,634 $ 6,497,286 
  Variable rate 2.14%   3,258,204   1,763,769 
   Total   3.56%   9,614,838   8,261,055 
  Deferred financing costs, net and other     (101,125)   (73,212) 
   Total, net     $ 9,513,713 $ 8,187,843 
               
 Unsecured Debt:         
  Senior unsecured notes 3.68% $ 850,000 $ 1,350,000 
  Deferred financing costs, net and other     (5,841)   (7,506) 
   Senior unsecured notes, net       844,159   1,342,494 
               
  Unsecured term loan 1.40%   187,500   - 
  Deferred financing costs, net and other     (4,362)   - 
   Unsecured term loan, net       183,138   - 
               
  Unsecured revolving credit facilities 1.38%   550,000   - 
               
   Total, net     $ 1,577,297 $ 1,342,494 
Schedule of Maturities of Long-Term Debt [Table Text Block]
 (Amounts in thousands)     Senior Unsecured  
       Debt and Unsecured  
       Revolving Credit  
    Mortgages Payable  Facilities  
 Year Ending December 31,        
 2016 $ 1,095,366 $ 550,000  
 2017   411,113   -  
 2018   441,354   -  
 2019   379,122   450,000  
 2020   2,835,451   187,500  
 Thereafter   4,452,432   400,000