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Area of a real estate property.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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Gross amount of debt extinguished.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Notes and Bonds Payable (Details)							3 Months Ended		6 Months Ended
Notes and Bonds Payable (Details)	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	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2019 USD ($)	Feb. 25, 2020 USD ($)	Feb. 24, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Notes and bonds payable							$ 1,554,936,000		$ 1,554,936,000				$ 1,414,069,000
Impact of settlement of forward-starting interest rate swap							$ 1,455,000	$ 4,577,000	$ 15,386,000	$ 5,301,000
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							$ 199,124,000		$ 199,124,000				199,013,000
Effective interest rate							2.00%		2.00%
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							$ 149,431,000		$ 149,431,000				0
Effective interest rate							3.15%		3.15%
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							$ 248,756,000		$ 248,756,000				248,540,000
Effective interest rate							3.95%		3.95%
Senior notes \| Senior notes due 2025, net of discount and issuance costs
Debt Instrument [Line Items]
Notes and bonds payable							$ 248,647,000		$ 248,647,000				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							$ 295,885,000		$ 295,885,000				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							$ 296,299,000		$ 296,299,000				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
Mortgages \| Mortgage notes payable, net of discounts and issuance costs and including premiums
Debt Instrument [Line Items]
Notes and bonds payable							$ 116,794,000		$ 116,794,000				$ 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							$ (1,455,000)	$ (4,577,000)	$ (11,119,000)	(5,301,000)
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									16000.00%
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		(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
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