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Debt (Summary Of Debt Outstanding) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 30, 2017
Dec. 21, 2017
Jun. 23, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Mortgages payable $ 491,505       $ 471,117
Notes payable 320,265       279,151
Net unamortized debt issuance costs (554)       (1,096)
Senior notes and debentures 2,401,440       1,976,594
Capital lease obligations 71,556       71,590
Total debt and capital lease obligations 3,284,766       2,798,452
Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance 491,561       466,305
Net unamortized (discount)/premium and debt issuance costs (56)       4,812
Notes Payable          
Debt Instrument [Line Items]          
Notes payable 320,819       280,247
Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance 2,419,200       1,994,200
Net unamortized (discount)/premium and debt issuance costs (17,760)       (17,606)
The Grove at Shrewsbury (West) | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 10,545       10,792
Interest rate 6.38%        
Rollingwood Apartments | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 20,820       21,283
Interest rate 5.54%        
The Shops at Sunset Place | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 66,603       68,634
Interest rate 5.624%        
29th Place | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 4,341       4,553
Interest rate 5.91%        
Sylmar Towne Center | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 17,362       0
Interest rate 5.39%        
Plaza Del Sol | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 8,579       0
Interest rate 5.23%        
THE AVENUE at White Marsh | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 52,705       52,705
Interest rate 3.35%        
Montrose Crossing | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 71,054       72,726
Interest rate 4.20%        
Azalea | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 40,000       0
Interest rate 3.73%        
Bell Gardens | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 13,184       0
Interest rate 4.06%        
Plaza El Segundo | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 125,000       175,000
Interest rate 3.83%        
The Grove at Shrewsbury (East) | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 43,600       42,536
Interest rate 3.77%        
Brook 35 | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 11,500       11,500
Interest rate 4.65%        
Chelsea | Mortgages Payable          
Debt Instrument [Line Items]          
Principal balance $ 6,268       6,576
Interest rate 5.36%        
Term Loan | Notes Payable          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 0.90%        
Other Notes Payable $ 275,000       275,000
Revolving credit facility | Notes Payable          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 0.825%        
Revolving credit facility $ 41,000       0
Various | Notes Payable          
Debt Instrument [Line Items]          
Interest rate 11.31%        
Other Notes Payable $ 4,819       5,247
5.90% notes | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 0 $ 150,000     150,000
Interest rate 5.90%        
2.55% notes | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 250,000       250,000
Interest rate 2.55%        
3.00% notes | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 250,000       250,000
Interest rate 3.00%        
2.75% notes | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 275,000       275,000
Interest rate 2.75%        
3.95% notes | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 300,000       300,000
Interest rate 3.95%        
7.48% debentures | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 29,200       29,200
Interest rate 7.48%        
3.25% Senior notes | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 475,000   $ 175,000 $ 300,000 0
Interest rate 3.25%   3.25%    
6.82% medium term notes | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 40,000       40,000
Interest rate 6.82%        
4.50% notes | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 550,000     $ 100,000 450,000
Interest rate 4.50%     4.50%  
3.625% Senior notes | Senior Notes and Debentures          
Debt Instrument [Line Items]          
Principal balance $ 250,000       $ 250,000
Interest rate 3.625%