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Mortgages and Notes Payable (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
extension
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 24, 2020
USD ($)
Debt Instrument [Line Items]            
Mortgages and notes payable, net $ 2,543,710 $ 2,085,831        
Less-unamortized debt issuance costs (13,018) (9,164)        
Scheduled future principal payments [Abstract]            
2020 248          
2021 300,560          
2022 521,842          
2023 251,180          
2024 1,281          
Thereafter 1,481,617          
Less-unamortized debt issuance costs (13,018) (9,164)        
Mortgages and notes payable, net 2,543,710 2,085,831        
Gains/(losses) on debt extinguishment $ (640) 0 $ (26)      
Lender covenant compliance to accelerate outstanding borrowings 51.00%          
Cross-default minimum threshold $ 30,000          
Holders covenant compliance of bonds 25.00%          
Uncured covenant compliance default period 60 days          
Capitalized Interest [Abstract]            
Capitalized Interest $ 5,600 $ 6,700 $ 8,800      
4.0% Mortgage Loan Due 2029 [Member]            
Debt Instrument [Line Items]            
Current interest rate (in hundredths)     4.00%      
Scheduled future principal payments [Abstract]            
Principal amount of debt     $ 100,000      
Scheduled maturity date     May 01, 2029      
Debt issuance costs     $ 800      
3.875% (4.038% effective rate) Notes due 2027 [Member]            
Debt Instrument [Line Items]            
Current interest rate (in hundredths)     4.038%      
Scheduled future principal payments [Abstract]            
Principal amount of debt     $ 300,000      
Scheduled maturity date     Mar. 01, 2027      
Original issuance discount     $ 4,000      
Stated interest rate (in hundredths)     3.875%      
Debt issuance costs     $ 2,500      
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        
Scheduled maturity date   Mar. 15, 2028        
Original issuance discount   $ 4,100        
Stated interest rate (in hundredths)   4.125%        
Debt issuance costs   $ 2,900        
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          
Scheduled maturity date Apr. 15, 2029          
Original issuance discount $ 1,000          
Stated interest rate (in hundredths) 4.20%          
Debt issuance costs $ 3,100          
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          
Scheduled maturity date Feb. 15, 2030          
Original issuance discount $ 1,000          
Stated interest rate (in hundredths) 3.05%          
Debt issuance costs $ 3,400          
Variable Rate Term Loan due 2020 [Member]            
Scheduled future principal payments [Abstract]            
Early repayment of debt 225,000   125,000      
Principal amount of debt       $ 350,000    
Scheduled maturity date       Jun. 01, 2020    
Interest rate, basis spread (in hundredths)       1.10%    
Debt issuance costs       $ 1,300    
Gains/(losses) on debt extinguishment (400)   (400)      
Variable Rate Term Loan due 2020 [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Scheduled future principal payments [Abstract]            
Interest rate basis       LIBOR plus 110 basis points    
Variable Rate Term Loan due 2022 [Member]            
Scheduled future principal payments [Abstract]            
Early repayment of debt 100,000          
Principal amount of debt     200,000 $ 150,000    
Scheduled maturity date       Jan. 01, 2022    
Interest rate, basis spread (in hundredths)       1.10%    
Debt issuance costs     300      
Gains/(losses) on debt extinguishment (300)          
Variable Rate Term Loan due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Scheduled future principal payments [Abstract]            
Interest rate basis       LIBOR plus 110 basis points    
Variable Rate Term Loan (2) due 2022 [Member]            
Scheduled future principal payments [Abstract]            
Principal amount of debt     $ 200,000      
Term of debt instrument (in years)     5 years      
Scheduled maturity date     Nov. 01, 2022      
Interest rate basis     LIBOR plus 110 basis points      
Interest rate, basis spread (in hundredths)     1.10%      
Debt issuance costs     $ 1,100      
Gains/(losses) on debt extinguishment     (400)      
Revolving Credit Facility due 2022 [Member]            
Scheduled future principal payments [Abstract]            
Maximum borrowing capacity on revolving credit facility     $ 600,000 $ 475,000    
Maturity date on revolving credit facility     Jan. 01, 2022      
Additional borrowing capacity on revolving credit facility     $ 400,000      
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 221,000          
Outstanding letters of credit on revolving credit facility 100          
Unused borrowing capacity on revolving credit facility 378,900          
Interest rate, basis spread (in hundredths)     1.00%      
Debt issuance costs     $ 3,500      
Gains/(losses) on debt extinguishment     $ (100)      
Revolving Credit Facility due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Scheduled future principal payments [Abstract]            
Interest rate     LIBOR plus 100 basis points      
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        
5.10%(4.22% effective rate) Mortgage Loan due 2017 [Member]            
Debt Instrument [Line Items]            
Current interest rate (in hundredths)     4.22%      
Scheduled future principal payments [Abstract]            
Early repayment of debt     $ 108,200      
Gains/(losses) on debt extinguishment     $ 400      
Variable Rate Term Loan (1) due 2019 [Member]            
Scheduled future principal payments [Abstract]            
Scheduled maturity date     Jan. 01, 2019      
Interest rate basis     LIBOR plus 120 basis points      
Interest rate, basis spread (in hundredths)     1.20%      
5.85% (5.88% effective rate) Notes due 2017 [Member]            
Debt Instrument [Line Items]            
Current interest rate (in hundredths)     5.85%      
Scheduled future principal payments [Abstract]            
Principal amount of debt     $ 379,700      
Variable Rate Term Loan (2) due 2019 [Member]            
Scheduled future principal payments [Abstract]            
Principal amount of debt         $ 225,000  
Term of debt instrument (in years)         7 years  
Scheduled maturity date         Jan. 01, 2019  
Interest rate, basis spread (in hundredths)         1.75%  
Variable Rate Term Loan (2) due 2019 [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Scheduled future principal payments [Abstract]            
Interest rate basis         LIBOR plus 175 basis points  
6.11% (5.36% effective rate) Mortgage Loan due 2017 (Note A) [Member]            
Debt Instrument [Line Items]            
Current interest rate (in hundredths)         5.36%  
Scheduled future principal payments [Abstract]            
Early repayment of debt     18,000      
Principal amount of debt         $ 18,000  
Scheduled maturity date         Jul. 06, 2017  
Percentage of partner's interest in asset acquired (in hundredths)         77.20%  
6.11% (8.60% effective rate) Mortgage Loan due 2017 (Note B) [Member]            
Debt Instrument [Line Items]            
Current interest rate (in hundredths)         8.60%  
Scheduled future principal payments [Abstract]            
Early repayment of debt     500      
Principal amount of debt         $ 10,200  
Scheduled maturity date         Jul. 06, 2017  
Gains/(losses) on debt extinguishment     $ 400      
Secured indebtedness [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 95,303 97,179        
Aggregate undepreciated book value of secured real estate assets 147,100          
Annual repayments through principal amortization 1,900          
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 95,303 97,179        
Secured indebtedness [Member] | 4.0% Mortgage Loan Due 2029 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 95,303 97,179        
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 95,303 97,179        
Unsecured indebtedness [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 2,461,425 1,997,816        
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 2,461,425 1,997,816        
Unsecured indebtedness [Member] | 3.20% (3.363% effective rate) Notes due 2021 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 299,369 298,936        
Unamortized discount 600 1,100        
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 299,369 298,936        
Unsecured indebtedness [Member] | 3.625% (3.752% effective rate) Notes due 2023 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 249,201 248,938        
Unamortized discount 800 1,100        
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 249,201 248,938        
Unsecured indebtedness [Member] | 3.875% (4.038% effective rate) Notes due 2027 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 297,134 296,734        
Unamortized discount 2,900 3,300        
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 297,134 296,734        
Unsecured indebtedness [Member] | 4.125% (4.271% effective rate) Notes due 2028 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 346,621 346,208        
Unamortized discount 3,400 3,800        
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 346,621 346,208        
Unsecured indebtedness [Member] | 4.20% (4.234% effective rate) Notes due 2029 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 349,091          
Unamortized discount 900          
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 349,091          
Unsecured indebtedness [Member] | 3.050% (3.079% effective rate) Notes due 2030 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 399,009          
Unamortized discount 1,000          
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 399,009          
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2020 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net 0 225,000        
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net 0 225,000        
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2022 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net $ 100,000 200,000        
Interest rate under derivative instruments (in hundredths) 2.79%          
Current interest rate (in hundredths) 2.81%          
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net $ 100,000 200,000        
Unsecured indebtedness [Member] | Variable Rate Term Loan (2) due 2022 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net $ 200,000 200,000        
Current interest rate (in hundredths) 2.90%          
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net $ 200,000 200,000        
Unsecured indebtedness [Member] | Revolving Credit Facility due 2022 [Member]            
Debt Instrument [Line Items]            
Mortgages and notes payable, net $ 221,000 182,000        
Current interest rate (in hundredths) 2.73%          
Scheduled future principal payments [Abstract]            
Mortgages and notes payable, net $ 221,000 $ 182,000        
Subsequent Event [Member] | Revolving Credit Facility due 2022 [Member]            
Scheduled future principal payments [Abstract]            
Amount outstanding on revolving credit facility           $ 225,000
Outstanding letters of credit on revolving credit facility           100
Unused borrowing capacity on revolving credit facility           $ 374,900