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Notes and Bonds Payable (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Feb. 24, 2022	Feb. 18, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Notes and bonds payable	$ 2,063,755,000		$ 2,063,755,000				$ 1,801,325,000
Impact of settlement of forward-starting interest rate swap	(1,663,000)	$ 807,000	(6,822,000)	$ (2,043,000)
Mortgages
Debt Instrument [Line Items]
Effective interest rate					6.17%	4.70%
Line of credit | $700 million Unsecured Credit Facility
Debt Instrument [Line Items]
Notes and bonds payable	$ 490,500,000		$ 490,500,000				210,000,000
Effective interest rate	2.69%		2.69%
Credit facility	$ 700,000,000		$ 700,000,000
Medium-term notes | $200 million Unsecured Term Loan due 2024, net of issuance costs
Debt Instrument [Line Items]
Notes and bonds payable	$ 199,572,000		$ 199,572,000				199,460,000
Effective interest rate	2.55%		2.55%
Term-loan facility	$ 200,000,000		$ 200,000,000
Medium-term notes | $150 million Unsecured Term Loan due 2026, net of issuance costs
Debt Instrument [Line Items]
Notes and bonds payable	$ 149,447,000		$ 149,447,000				149,376,000
Effective interest rate	2.79%		2.79%
Term-loan facility	$ 150,000,000		$ 150,000,000
Senior notes | Senior Notes due 2025, net of discount and issuance costs
Debt Instrument [Line Items]
Notes and bonds payable	$ 249,176,000		$ 249,176,000				249,040,000
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	$ 296,864,000		$ 296,864,000				296,612,000
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	$ 296,989,000		$ 296,989,000				296,813,000
Effective interest rate	2.71%		2.71%
Senior notes | Senior Notes due 2031, net of discount and issuance costs
Debt Instrument [Line Items]
Notes and bonds payable	$ 295,601,000		$ 295,601,000				295,374,000
Effective interest rate	2.24%		2.24%
Mortgages | Mortgage notes payable, net of discounts and issuance costs and including premiums
Debt Instrument [Line Items]
Notes and bonds payable	$ 85,606,000		$ 85,606,000				$ 104,650,000
Effective interest rate	3.97%		3.97%
Settled interest rate swaps
Debt Instrument [Line Items]
Impact of settlement of forward-starting interest rate swap	$ (1,663,000)	$ 807,000	$ (6,822,000)	$ (2,043,000)
Settled interest rate swaps | Medium-term notes | $200 million Unsecured Term Loan due 2024, net of issuance costs
Debt Instrument [Line Items]
Notional amount	$ 75,000,000		$ 75,000,000
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, net of issuance costs
Debt Instrument [Line Items]
Notional amount	$ 100,000,000		$ 100,000,000
Weighted average interest rate (percent)	2.23%		2.23%
Basis spread on variable rate			95.00%
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 | 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

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