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Mortgages and Notes Payable (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
extension
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 29, 2021
USD ($)
Debt Instrument [Line Items]        
Mortgages and notes payable, net $ 2,470,021,000 $ 2,543,710,000    
Less-unamortized debt issuance costs (13,981,000) (13,018,000)    
Scheduled future principal payments [Abstract]        
2021 150,504,000      
2022 200,686,000      
2023 251,024,000      
2024 1,124,000      
2025 (185,000)      
Thereafter 1,880,849,000      
Less-unamortized debt issuance costs (13,981,000) (13,018,000)    
Mortgages and notes payable, net 2,470,021,000 2,543,710,000    
Gains/(losses) on debt extinguishment $ (3,674,000) (640,000) $ 0  
Lender covenant compliance to accelerate outstanding borrowings 51.00%      
Cross-default minimum threshold $ 30,000,000.0      
Holders covenant compliance of bonds 25.00%      
Uncured covenant compliance default period 60 days      
Maximum liquidity requirements 1 year      
Capitalized Interest [Abstract]        
Capitalized Interest $ 8,300,000 $ 5,600,000 $ 6,700,000  
3.20% (3.363% effective rate) Notes due 2021 [Member]        
Scheduled future principal payments [Abstract]        
Early repayment of debt 150,000,000.0      
Principal amount of debt $ 150,000,000.0      
Stated interest rate (in hundredths) 3.20%      
Purchase price of debt (in hundredths) 101.908%      
4.125% (4.271% effective rate) Notes due 2028 [Member]        
Debt Instrument [Line Items]        
Current interest rate (in hundredths)     4.271%  
Scheduled future principal payments [Abstract]        
Principal amount of debt     $ 350,000,000.0  
Original issuance discount     $ 4,100,000  
Stated interest rate (in hundredths)     4.125%  
Debt issuance costs     $ 2,900,000  
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]        
Principal amount of debt   $ 350,000,000.0    
Original issuance discount   $ 1,000,000.0    
Stated interest rate (in hundredths)   4.20%    
Debt issuance costs   $ 3,100,000    
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]        
Principal amount of debt   $ 400,000,000.0    
Original issuance discount   $ 1,000,000.0    
Stated interest rate (in hundredths)   3.05%    
Debt issuance costs   $ 3,400,000    
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]        
Principal amount of debt $ 400,000,000.0      
Original issuance discount $ 1,600,000      
Stated interest rate (in hundredths) 2.60%      
Debt issuance costs $ 3,400,000      
Variable Rate Term Loan due 2022 [Member]        
Scheduled future principal payments [Abstract]        
Early repayment of debt $ 100,000,000.0 100,000,000.0    
Principal amount of debt   200,000,000.0    
Interest rate, basis spread (in hundredths) 1.10%      
Gains/(losses) on debt extinguishment   (300,000)    
Variable Rate Term Loan due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Scheduled future principal payments [Abstract]        
Interest rate basis LIBOR      
Revolving Credit Facility due 2022 [Member]        
Scheduled future principal payments [Abstract]        
Maximum borrowing capacity on revolving credit facility $ 600,000,000.0      
Additional borrowing capacity on revolving credit facility $ 400,000,000.0      
Number of additional maturity extensions | extension 2      
Term of optional extensions 6 months      
Annual facility fee (in hundredths) 0.20%      
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      
Interest rate, basis spread (in hundredths) 1.00%      
Revolving Credit Facility due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Scheduled future principal payments [Abstract]        
Interest rate LIBOR      
Variable Rate Term Loan due 2020 [Member]        
Scheduled future principal payments [Abstract]        
Early repayment of debt   $ 225,000,000.0    
Term of debt instrument (in years)   7 years    
Interest rate, basis spread (in hundredths)   1.10%    
Gains/(losses) on debt extinguishment   $ (400,000)    
Variable Rate Term Loan due 2020 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Scheduled future principal payments [Abstract]        
Interest rate basis   LIBOR    
7.50% Notes due 2018 [Member]        
Debt Instrument [Line Items]        
Current interest rate (in hundredths)     7.50%  
Scheduled future principal payments [Abstract]        
Principal amount of debt     $ 200,000,000.0  
Secured indebtedness [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net $ 93,350,000 $ 95,303,000    
Aggregate undepreciated book value of secured real estate assets 147,900,000      
Annual repayments through principal amortization 2,000,000.0      
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 93,350,000 95,303,000    
Secured indebtedness [Member] | 4.0% Mortgage Loan Due 2029 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 93,350,000 95,303,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 93,350,000 95,303,000    
Unsecured indebtedness [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 2,390,652,000 2,461,425,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 2,390,652,000 2,461,425,000    
Unsecured indebtedness [Member] | 3.20% (3.363% effective rate) Notes due 2021 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 149,901,000 299,369,000    
Unamortized discount 100,000 600,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 149,901,000 299,369,000    
Unsecured indebtedness [Member] | 3.625% (3.752% effective rate) Notes due 2023 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 249,464,000 249,201,000    
Unamortized discount 500,000 800,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 249,464,000 249,201,000    
Unsecured indebtedness [Member] | 3.875% (4.038% effective rate) Notes due 2027 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 297,534,000 297,134,000    
Unamortized discount 2,500,000 2,900,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 297,534,000 297,134,000    
Unsecured indebtedness [Member] | 4.125% (4.271% effective rate) Notes due 2028 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 347,035,000 346,621,000    
Unamortized discount 3,000,000.0 3,400,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 347,035,000 346,621,000    
Unsecured indebtedness [Member] | 4.20% (4.234% effective rate) Notes due 2029 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 349,189,000 349,091,000    
Unamortized discount 800,000 900,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 349,189,000 349,091,000    
Unsecured indebtedness [Member] | 3.050% (3.079% effective rate) Notes due 2030 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 399,106,000 399,009,000    
Unamortized discount 900,000 1,000,000.0    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 399,106,000 399,009,000    
Unsecured indebtedness [Member] | 2.600% (2.645% effective rate) Notes due 2031 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 398,423,000 0    
Unamortized discount 1,600,000      
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 398,423,000 0    
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2022 [Member]        
Debt Instrument [Line Items]        
Mortgages and notes payable, net 0 100,000,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net 0 100,000,000    
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) 1.25%      
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 0 221,000,000    
Scheduled future principal payments [Abstract]        
Mortgages and notes payable, net $ 0 $ 221,000,000    
Subsequent Event [Member] | Revolving Credit Facility due 2022 [Member]        
Scheduled future principal payments [Abstract]        
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