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Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 28, 2015
Aug. 03, 2015
Apr. 11, 2015
Mar. 16, 2015
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Jan. 09, 2015
Nov. 14, 2014
Debt Instrument                  
Issuance of senior notes, net of costs           $ 456,192,000 $ 0    
Mortgages                  
Debt Instrument                  
Extinguishment of Debt, Amount   $ 147,000,000              
Weighted Average Interest Rate of Debt Retired - Metlife Loans   7.90%              
Senior Notes | 4.50% Senior notes                  
Debt Instrument                  
Principal       $ 200,000,000         $ 250,000,000
Stated interest rate       4.50%          
Note offering percent of principal amount       105.38%          
Debt yield to maturity percent       4.18%          
Issuance of senior notes, net of costs       $ 208,600,000          
Senior Notes | 6.20% Senior Notes                  
Debt Instrument                  
Stated interest rate     6.20%            
Repayments of Debt     $ 200,000,000            
Redemption price     222,200,000            
Make-whole premium     19,200,000            
Accrued but unpaid interest     $ 3,000,000            
Senior Notes | 2.55% Senior Notes                  
Debt Instrument                  
Principal $ 250,000,000                
Stated interest rate 2.55%                
Issuance of senior notes, net of costs $ 247,500,000                
Line of Credit | Revolving Credit Facility                  
Debt Instrument                  
Maximum borrowing capacity under revolving credit facility         $ 600,000,000 600,000,000      
Maximum amount outstanding under revolving credit facility           $ 324,000,000      
Weighted average interest rate, before amortization of debt fees           1.10%      
Weighted average borrowings outstanding         219,200,000 $ 126,400,000      
Outstanding balance of revolving credit facility         $ 0 $ 0      
San Antonio Center | Mortgages                  
Debt Instrument                  
Principal               $ 18,700,000  
Fair value               $ 19,300,000  
Stated interest rate               5.27%  
Barracks Road | Mortgages                  
Debt Instrument                  
Extinguishment of Debt, Amount   $ 35,300,000              
Brick Plaza | Mortgages                  
Debt Instrument                  
Extinguishment of Debt, Amount   25,900,000              
Wynnewood | Mortgages                  
Debt Instrument                  
Extinguishment of Debt, Amount   25,500,000              
Lawrence Park | Mortgages                  
Debt Instrument                  
Extinguishment of Debt, Amount   25,000,000              
Wildwood | Mortgages                  
Debt Instrument                  
Extinguishment of Debt, Amount   22,000,000              
Hauppauge | Mortgages                  
Debt Instrument                  
Extinguishment of Debt, Amount   $ 13,300,000