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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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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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Debt - Unsecured Term Loans (Details)	12 Months Ended
Debt - Unsecured Term Loans (Details)	Dec. 31, 2021 USD ($) interest_rate_swap	Dec. 31, 2020 USD ($) interest_rate_swap	Dec. 01, 2021	Sep. 22, 2021 USD ($)	Dec. 01, 2020
Debt Instrument [Line Items]
Number of interest rate swaps \| interest_rate_swap	4	4
5 year - swapped to fixed rate \| Interest Rate Swap One \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 200,000,000.0	$ 250,000,000.0
Debt instrument, term	5 years	5 years
Unsecured term loans	$ 100,000,000	$ 100,000,000
Stated interest rate (percent)	2.6795%	2.6795%
5 year - swapped to fixed rate \| Interest Rate Swap Two \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 200,000,000.0	$ 250,000,000.0
Debt instrument, term	5 years	5 years
Unsecured term loans	$ 100,000,000	$ 100,000,000
Stated interest rate (percent)	2.6795%	2.6795%
5.5 year - swapped to fixed rate \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 200,000,000.0
Debt instrument, term	5 years 6 months
Unsecured term loans	$ 50,000,000
Stated interest rate (percent)	2.6915%
5.5 year - swapped to fixed rate \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 200,000,000.0
Debt instrument, term	5 years 6 months
Unsecured term loans	$ 50,000,000
Stated interest rate (percent)	2.699%
5.5 year - variable rate \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 200,000,000.0
Debt instrument, term	5 years 6 months
Unsecured term loans	$ 100,000,000
Stated interest rate (percent)	1.2993%
5.5 year - variable rate \| Interest Rate Swap One \| Unsecured Debt \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate (percent)			1.20%
5 year - variable rate \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 250,000,000.0
Debt instrument, term		5 years
Unsecured term loans		$ 50,000,000
Stated interest rate (percent)		1.3548%
5 year - variable rate \| Interest Rate Swap One \| Unsecured Debt \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate (percent)					1.20%
5.5 year - swapped to fixed rate \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 150,000,000.0
Debt instrument, term		5 years 6 months
Unsecured term loans		$ 50,000,000
Stated interest rate (percent)		2.6915%
5.5 year - swapped to fixed rate \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 150,000,000.0
Debt instrument, term		5 years 6 months
Unsecured term loans		$ 50,000,000
Stated interest rate (percent)		2.699%
5.5 year - variable rate \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 150,000,000.0
Debt instrument, term		5 years 6 months
Unsecured term loans		$ 50,000,000
Stated interest rate (percent)		1.3548%
Term Loan \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount				$ 400,000,000
Unsecured term loans	$ 400,000,000	$ 400,000,000
Issuance costs, net of accumulated amortization	(3,492,000)	(1,619,000)
Total mortgages payable, net	$ 396,508,000	$ 398,381,000