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Notes and Bonds Payable (Details)
3 Months Ended 9 Months Ended
Oct. 19, 2020
USD ($)
Oct. 01, 2020
USD ($)
ft²
Jun. 25, 2020
USD ($)
ft²
bond
Jun. 02, 2020
USD ($)
ft²
May 29, 2020
USD ($)
May 04, 2020
USD ($)
ft²
Mar. 04, 2020
USD ($)
derivative
Feb. 03, 2020
USD ($)
ft²
Sep. 30, 2020
USD ($)
ft²
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
ft²
Sep. 30, 2019
USD ($)
Oct. 02, 2020
USD ($)
Feb. 25, 2020
USD ($)
Feb. 24, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                                
Notes and bonds payable                 $ 1,554,395,000   $ 1,554,395,000         $ 1,414,069,000
Impact of settlement of forward-starting interest rate swap                 $ 74,000 $ 2,341,000 $ 15,459,000 $ 7,642,000        
Area of real estate property | ft²                 15,500,000   15,500,000          
Borrowings on term loan                     $ 150,000,000 50,000,000        
Line of credit | $700 million Unsecured Credit Facility                                
Debt Instrument [Line Items]                                
Notes and bonds payable                 $ 0   0         293,000,000
Credit facility                 700,000,000   700,000,000          
Medium-term notes | $200 million unsecured term loan facility, net of issuance costs                                
Debt Instrument [Line Items]                                
Notes and bonds payable                 $ 199,180,000   $ 199,180,000         199,013,000
Effective interest rate                 1.99%   1.99%          
Term-loan facility                 $ 200,000,000   $ 200,000,000          
Medium-term notes | $150 million unsecured term loan due 2026                                
Debt Instrument [Line Items]                                
Notes and bonds payable                 $ 149,455,000   $ 149,455,000         0
Effective interest rate                 3.14%   3.14%          
Borrowings on term loan         $ 150,000,000.0                      
Term-loan facility                 $ 150,000,000   $ 150,000,000          
Senior notes | Senior Notes due 2023, net of discount and issuance costs                                
Debt Instrument [Line Items]                                
Notes and bonds payable                 $ 248,863,000   $ 248,863,000         248,540,000
Effective interest rate                 3.95%   3.95%          
Senior notes | Senior Notes due 2023, net of discount and issuance costs | Subsequent event                                
Debt Instrument [Line Items]                                
Outstanding principal repaid $ 250,000,000.0                              
Payments to redeem unsecured senior notes 270,500,000                              
Debt redeemed, accrued interest 100,000                              
Debt redeemed, make whole amount 20,400,000                              
Write off of Deferred Debt Issuance Cost 1,100,000                              
Loss on early extinguishment of debt $ 21,500,000                              
Senior notes | Senior notes due 2025, net of discount and issuance costs                                
Debt Instrument [Line Items]                                
Notes and bonds payable                 $ 248,711,000   $ 248,711,000         248,522,000
Effective interest rate                 4.08%   4.08%          
Senior notes | Senior Notes due 2028, net of discount and issuance costs                                
Debt Instrument [Line Items]                                
Notes and bonds payable                 $ 296,003,000   $ 296,003,000         295,651,000
Effective interest rate                 3.84%   3.84%          
Senior notes | Senior notes due 2030, net of discount and issuance costs                                
Debt Instrument [Line Items]                                
Notes and bonds payable                 $ 296,384,000   $ 296,384,000         0
Effective interest rate             2.71%   2.71%   2.71%          
Fixed interest rate (percent)             2.40%                  
Term-loan facility             $ 300,000,000.0                  
Debt discount             1,000,000.0                  
Debt issuance costs             $ 2,800,000                  
Number of derivative instruments settled | derivative             2                  
Senior notes | Senior notes due 2031 | Subsequent event                                
Debt Instrument [Line Items]                                
Effective interest rate                         2.24%      
Fixed interest rate (percent)                         2.05%      
Term-loan facility                         $ 300,000,000.0      
Debt discount                         2,400,000      
Debt issuance costs                         $ 2,800,000      
Mortgages | Mortgage notes payable, net of discounts and issuance costs and including premiums                                
Debt Instrument [Line Items]                                
Notes and bonds payable                 $ 115,799,000   $ 115,799,000         $ 129,343,000
Effective interest rate                 4.38%   4.38%          
Settled interest rate swaps                                
Debt Instrument [Line Items]                                
Impact of settlement of forward-starting interest rate swap                 $ (74,000) (2,341,000) $ (11,192,000) (7,642,000)        
Settled interest rate swaps | Medium-term notes | $200 million unsecured term loan facility, net of issuance costs                                
Debt Instrument [Line Items]                                
Notional amount                 $ 75,000,000.0   $ 75,000,000.0          
Weighted average interest rate (percent)                 2.37%   2.37%          
Basis spread on variable rate                     100.00%          
Settled interest rate swaps | Medium-term notes | $150 million unsecured term loan due 2026                                
Debt Instrument [Line Items]                                
Notional amount                 $ 100,000,000.0   $ 100,000,000.0          
Weighted average interest rate (percent)                 2.23%   2.23%          
Basis spread on variable rate                     160.00%          
Settled interest rate swaps | Senior notes | Senior notes due 2025, net of discount and issuance costs                                
Debt Instrument [Line Items]                                
Impact of settlement of forward-starting interest rate swap                     $ 1,700,000          
Treasury lock                                
Debt Instrument [Line Items]                                
Notional amount                           $ 40,000,000.0 $ 75,000,000.0  
Impact of settlement of forward-starting interest rate swap             $ 4,300,000   $ 0 $ 0 (4,267,000) $ 0        
Treasury lock | Senior notes | Senior notes due 2025, net of discount and issuance costs                                
Debt Instrument [Line Items]                                
Impact of settlement of forward-starting interest rate swap             $ 4,300,000       $ 4,300,000          
Mortgages                                
Debt Instrument [Line Items]                                
Fixed interest rate (percent)       6.44%   5.74%   6.10%                
Outstanding principal repaid       $ 12,600,000   $ 300,000   $ 5,900,000                
Area of real estate property | ft²       67,510   83,318   68,860                
Mortgages | Subsequent event                                
Debt Instrument [Line Items]                                
Fixed interest rate (percent)   5.47%                            
Outstanding principal repaid   $ 4,200,000                            
Area of real estate property | ft²   40,171                            
Bonds                                
Debt Instrument [Line Items]                                
Area of real estate property | ft²     60,476                          
Number of bonds repaid | bond     3                          
Bonds | 5.63% Bonds                                
Debt Instrument [Line Items]                                
Fixed interest rate (percent)     5.63%                          
Outstanding principal repaid     $ 500,000                          
Bonds | 6.63% Bonds                                
Debt Instrument [Line Items]                                
Fixed interest rate (percent)     6.63%                          
Outstanding principal repaid     $ 2,800,000                          
Bonds | 6.88% Bonds                                
Debt Instrument [Line Items]                                
Fixed interest rate (percent)     6.88%                          
Outstanding principal repaid     $ 7,000,000.0