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Mortgages and Notes Payable (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
numberOfBuildings
extension
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 28, 2022
USD ($)
Debt Instrument [Line Items]        
Mortgages and notes payable, net $ 2,788,915,000 $ 2,470,021,000    
Less-unamortized debt issuance costs (15,207,000) (13,981,000)    
Scheduled future principal payments [Abstract]        
2022 206,524,000      
2023 257,059,000      
2024 7,365,000      
2025 77,176,000      
2026 6,911,000      
Thereafter 2,249,087,000      
Less-unamortized debt issuance costs (15,207,000) (13,981,000)    
Mortgages and notes payable, net 2,788,915,000 2,470,021,000    
Gains/(losses) on debt extinguishment $ (286,000) (3,674,000) $ (640,000)  
Lender covenant compliance to accelerate outstanding borrowings 51.00%      
Cross-default minimum threshold $ 35,000,000      
Holders covenant compliance of bonds 25.00%      
Uncured covenant compliance default period 60 days      
Maximum liquidity requirements 1 year      
Capitalized Interest [Abstract]        
Capitalized Interest $ 9,600,000 $ 8,300,000 $ 5,600,000  
3.20% (3.363% effective rate) Notes due 2021 [Member]        
Scheduled future principal payments [Abstract]        
Gains/(losses) on debt extinguishment (100,000)      
Principal amount of debt 150,000,000      
Stated interest rate (in hundredths)   3.20%    
Early repayment of debt   $ 150,000,000    
Purchase price of debt (in hundredths)   101.908%    
3.625% (3.752% effective rate) Notes due 2023 [Member]        
Scheduled future principal payments [Abstract]        
Principal amount of debt 250,000,000      
4.20% (4.234% effective rate) Notes due 2029 [Member]        
Debt Instrument [Line Items]        
Current interest rate (in hundredths)     4.234%  
Scheduled future principal payments [Abstract]        
Debt issuance costs     $ 3,100,000  
Principal amount of debt     $ 350,000,000  
Stated interest rate (in hundredths)     4.20%  
Original issuance discount     $ 1,000,000  
3.050% (3.079% effective rate) Notes due 2030 [Member]        
Debt Instrument [Line Items]        
Current interest rate (in hundredths)     3.079%  
Scheduled future principal payments [Abstract]        
Debt issuance costs     $ 3,400,000  
Principal amount of debt     $ 400,000,000  
Stated interest rate (in hundredths)     3.05%  
Original issuance discount     $ 1,000,000  
2.600% (2.645% effective rate) Notes due 2031 [Member]        
Debt Instrument [Line Items]        
Current interest rate (in hundredths)   2.645%    
Scheduled future principal payments [Abstract]        
Debt issuance costs   $ 3,400,000    
Principal amount of debt   $ 400,000,000    
Stated interest rate (in hundredths)   2.60%    
Original issuance discount   $ 1,600,000    
Revolving Credit Facility due 2022 [Member]        
Scheduled future principal payments [Abstract]        
Maximum borrowing capacity on revolving credit facility 750,000,000 $ 600,000,000    
Additional borrowing capacity on revolving credit facility $ 550,000,000      
Number of additional maturity extensions | extension 2      
Term of optional extensions 6 months      
Interest rate, basis spread (in hundredths) 0.90%      
Annual facility fee (in hundredths) 0.20%      
Debt issuance costs $ 4,800,000      
Gains/(losses) on debt extinguishment (100,000)      
Amount outstanding on revolving credit facility 70,000,000      
Outstanding letters of credit on revolving credit facility 100,000      
Unused borrowing capacity on revolving credit facility $ 679,900,000      
Revolving Credit Facility due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Scheduled future principal payments [Abstract]        
Interest rate LIBOR      
PAC Portfolio Acquisition [Member]        
Debt Instrument [Line Items]        
Current interest rate (in hundredths)   3.54%    
Scheduled future principal payments [Abstract]        
Debt issuance costs $ 3,500,000      
Number of loans assumed in acquisition | numberOfBuildings 4      
Principal amount of debt $ 403,000,000      
Term of debt instrument (in years) 10 years 8 months 12 days      
Unsecured Bridge Facility Due 2022 [Member]        
Scheduled future principal payments [Abstract]        
Maximum borrowing capacity on revolving credit facility $ 200,000,000      
Interest rate, basis spread (in hundredths) 0.85%      
Annual facility fee (in hundredths) 0.20%      
Debt issuance costs $ 1,000,000      
Gains/(losses) on debt extinguishment $ (200,000)      
Term of debt instrument (in years) 6 months      
Unsecured Bridge Facility Due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Scheduled future principal payments [Abstract]        
Interest rate LIBOR      
Variable Rate Term Loan due 2022 [Member]        
Scheduled future principal payments [Abstract]        
Interest rate, basis spread (in hundredths)   1.10%    
Gains/(losses) on debt extinguishment   $ (3,700,000) (300,000)  
Principal amount of debt     200,000,000  
Early repayment of debt   $ 100,000,000 $ 100,000,000  
Variable Rate Term Loan due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Scheduled future principal payments [Abstract]        
Interest rate basis   LIBOR    
Variable Rate Term Loan due 2020 [Member]        
Scheduled future principal payments [Abstract]        
Interest rate, basis spread (in hundredths)     1.10%  
Gains/(losses) on debt extinguishment     $ (400,000)  
Term of debt instrument (in years)     7 years  
Early repayment of debt     $ 225,000,000  
Variable Rate Term Loan due 2020 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Scheduled future principal payments [Abstract]        
Interest rate basis     LIBOR  
Secured indebtedness [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net $ 491,942,000 $ 93,350,000    
Aggregate undepreciated book value of secured real estate assets 727,800,000      
Annual repayments through principal amortization 3,800,000      
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 491,942,000 93,350,000    
Secured indebtedness [Member] | 4.27% (3.61% effective rate) mortgage loan due 2028 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 115,731,000 0    
Unamortized premium 3,900,000      
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 115,731,000 0    
Secured indebtedness [Member] | 4.0% Mortgage Loan Due 2029 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 91,318,000 93,350,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 91,318,000 93,350,000    
Secured indebtedness [Member] | 3.61% (3.19% effective rate) mortgage loan due 2029 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 84,973,000 0    
Unamortized premium 2,300,000      
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 84,973,000 0    
Secured indebtedness [Member] | 3.40% (3.50% effective rate) mortgage loan due 2033 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 69,422,000 0    
Unamortized discount 600,000      
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 69,422,000 0    
Secured indebtedness [Member] | 4.60% (3.73% effective rate) mortgage loan due 2037 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 130,498,000 0    
Unamortized premium 10,000,000      
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 130,498,000 0    
Unsecured indebtedness [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 2,312,180,000 2,390,652,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 2,312,180,000 2,390,652,000    
Unsecured indebtedness [Member] | 3.20% (3.363% effective rate) Notes due 2021 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 0 149,901,000    
Unamortized discount   100,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 0 149,901,000    
Unsecured indebtedness [Member] | 3.625% (3.752% effective rate) Notes due 2023 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 249,726,000 249,464,000    
Unamortized discount 300,000 500,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 249,726,000 249,464,000    
Unsecured indebtedness [Member] | 3.875% (4.038% effective rate) Notes due 2027 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 297,934,000 297,534,000    
Unamortized discount 2,100,000 2,500,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 297,934,000 297,534,000    
Unsecured indebtedness [Member] | 4.125% (4.271% effective rate) Notes due 2028 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 347,449,000 347,035,000    
Unamortized discount 2,600,000 3,000,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 347,449,000 347,035,000    
Unsecured indebtedness [Member] | 4.20% (4.234% effective rate) Notes due 2029 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 349,288,000 349,189,000    
Unamortized discount 700,000 800,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 349,288,000 349,189,000    
Unsecured indebtedness [Member] | 3.050% (3.079% effective rate) Notes due 2030 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 399,204,000 399,106,000    
Unamortized discount 800,000 900,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 399,204,000 399,106,000    
Unsecured indebtedness [Member] | 2.600% (2.645% effective rate) Notes due 2031 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 398,579,000 398,423,000    
Unamortized discount 1,400,000 1,600,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 398,579,000 398,423,000    
Unsecured indebtedness [Member] | Variable Rate Term Loan (2) due 2022 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net $ 200,000,000 200,000,000    
Interest rate under derivative instruments (in hundredths) 2.79%      
Current interest rate (in hundredths) 1.20%      
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net $ 200,000,000 200,000,000    
Unsecured indebtedness [Member] | Revolving Credit Facility due 2022 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net $ 70,000,000 0    
Current interest rate (in hundredths) 1.00%      
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net $ 70,000,000 $ 0    
Subsequent Event [Member] | Revolving Credit Facility due 2022 [Member]        
Scheduled future principal payments [Abstract]        
Amount outstanding on revolving credit facility       $ 70,000,000
Outstanding letters of credit on revolving credit facility       100,000
Unused borrowing capacity on revolving credit facility       $ 679,900,000