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Mortgages and Notes Payable (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
extension
Sep. 30, 2019
USD ($)
Oct. 20, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Mortgages and notes payable $ 2,469,554,000 $ 2,469,554,000     $ 2,543,710,000
Unamortized debt issuance costs (14,533,000) (14,533,000)     (13,018,000)
Aggregate losses on debt extinguishment (3,700,000) $ (3,671,000) $ (640,000)    
Maximum liquidity requirements (in years)   1 year      
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity on revolving credit facility 600,000,000.0 $ 600,000,000.0      
Additional borrowing capacity on revolving credit facility 400,000,000.0 $ 400,000,000.0      
Number of additional extensions | extension   2      
Term of optional extension   6 months      
Amount outstanding on revolving credit facility 0 $ 0      
Outstanding letters of credit on revolving credit facility 100,000 100,000      
Unused borrowing capacity on revolving credit facility 599,900,000 599,900,000      
2.600% (2.645% Effective Rate) Notes Due 2031 [Member]          
Debt Instrument [Line Items]          
Principal amount of debt $ 400,000,000.0 $ 400,000,000.0      
Stated interest rate (in hundredths) 2.60% 2.60%      
Original issuance discount $ 1,600,000 $ 1,600,000      
Effective interest rate, yield to maturity (in hundredths) 2.645% 2.645%      
Deferred financing fees $ 3,400,000 $ 3,400,000      
3.20% (3.363% effective rate) Notes due 2021 [Member]          
Debt Instrument [Line Items]          
Principal amount of debt $ 150,000,000.0 $ 150,000,000.0      
Stated interest rate (in hundredths) 3.20% 3.20%      
Purchase price of debt (in hundredths) 101.908% 101.908%      
Early repayment of debt $ 150,000,000.0        
Variable Rate Term Loan Due 2022 [Member]          
Debt Instrument [Line Items]          
Early repayment of debt 100,000,000.0        
Secured indebtedness [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable 93,846,000 $ 93,846,000     95,303,000
Aggregate undepreciated book value of secured real estate assets 147,600,000 147,600,000      
Unsecured indebtedness [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable $ 2,390,241,000 $ 2,390,241,000     $ 2,461,425,000
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Facility interest rate basis   LIBOR      
Interest rate, basis spread (in hundredths)   1.00%      
Annual facility fee (in hundredths)   0.20%      
London Interbank Offered Rate (LIBOR) [Member] | Variable Rate Term Loan Due 2022 [Member]          
Debt Instrument [Line Items]          
Facility interest rate basis LIBOR        
Interest rate, basis spread (in hundredths) 1.10%        
Subsequent Event [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Amount outstanding on revolving credit facility       $ 0  
Outstanding letters of credit on revolving credit facility       100,000  
Unused borrowing capacity on revolving credit facility       $ 599,900,000