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Mortgages and Notes Payable (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
extension
Jul. 19, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]        
Mortgages and notes payable $ 2,804,314,000 $ 2,804,314,000   $ 2,788,915,000
Unamortized debt issuance costs (16,581,000) (16,581,000)   (15,207,000)
Debt issuance costs $ 2,700,000 2,700,000    
Maximum liquidity requirements 1 year      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity on credit facility $ 750,000,000 750,000,000    
Additional borrowing capacity on revolving credit facility 400,000,000 $ 400,000,000    
Number of additional extensions | extension   2    
Term of optional extension   6 months    
Temporary reduction in interest rate due to sustainability goals (in hundredths)   0.01%    
Amount outstanding on revolving credit facility 90,000,000 $ 90,000,000    
Outstanding letters of credit on revolving credit facility 100,000 100,000    
Unused borrowing capacity on revolving credit facility 659,900,000 659,900,000    
Variable Rate Term Loan Due 2026        
Debt Instrument [Line Items]        
Principal amount of debt 200,000,000 $ 200,000,000    
Variable Rate Term Loan Due 2027        
Debt Instrument [Line Items]        
Temporary reduction in interest rate due to sustainability goals (in hundredths)   0.01%    
Principal amount of debt 150,000,000 $ 150,000,000    
3.625% (3.752% Effective Rate) Notes Due 2023        
Debt Instrument [Line Items]        
Principal amount of debt 250,000,000 250,000,000    
Secured indebtedness [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable 488,000,000 488,000,000   491,942,000
Aggregate undepreciated book value of secured real estate assets 732,300,000 732,300,000    
Unsecured indebtedness [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable $ 2,332,895,000 $ 2,332,895,000   $ 2,312,180,000
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)   0.90%    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Facility interest rate basis   SOFR    
Interest rate, basis spread (in hundredths)   0.85%    
Annual facility fee (in hundredths)   0.20%    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Term Loan Due 2027        
Debt Instrument [Line Items]        
Interest rate, basis spread (in hundredths)   0.95%    
Variable interest rate basis   SOFR    
SOFR Related Spread Adjustment [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Interest rate, basis spread (in hundredths)   0.10%    
SOFR Related Spread Adjustment [Member] | Variable Rate Term Loan Due 2027        
Debt Instrument [Line Items]        
Interest rate, basis spread (in hundredths)   0.10%    
Subsequent Event [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Amount outstanding on revolving credit facility     $ 130,000,000  
Outstanding letters of credit on revolving credit facility     100,000  
Unused borrowing capacity on revolving credit facility     $ 619,900,000