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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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Debt - Line of Credit (Details)	9 Months Ended
Debt - Line of Credit (Details)	Sep. 30, 2021 USD ($) swap	Sep. 22, 2021 USD ($)	Sep. 01, 2021
Line of Credit Facility [Line Items]
Number of interest rate swaps \| swap	4
Number of interest rate swaps to be terminated \| swap	2
5 year - swapped to fixed rate \| Term loans \| Interest Rate Swap One
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 200,000,000.0
Debt instrument, term	5 years
Unsecured term loans	$ 100,000,000
Interest rate (percent)	2.6795%
5 year - swapped to fixed rate \| Term loans \| Interest Rate Swap Two
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 200,000,000.0
Debt instrument, term	5 years
Unsecured term loans	$ 100,000,000
Interest rate (percent)	2.6795%
5 year - swapped to fixed rate \| Term loans \| Interest Rate Swap Three
Line of Credit Facility [Line Items]
Interest rate (percent)	2.68%
Notional amount	$ 100,000,000
5.5 year - swapped to fixed rate \| Term loans
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 200,000,000.0
Debt instrument, term	5 years 6 months
Unsecured term loans	$ 50,000,000
Interest rate (percent)	2.6915%
5.5 year - swapped to fixed rate \| Term loans \| Interest Rate Swap Five
Line of Credit Facility [Line Items]
Interest rate (percent)	2.69%
Number of interest rate swaps \| swap	2
Notional amount	$ 50,000,000
5.5 year - swapped to fixed rate \| Term loans
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 200,000,000.0
Debt instrument, term	5 years 6 months
Unsecured term loans	$ 50,000,000
Interest rate (percent)	2.699%
5.5 year - swapped to fixed rate \| Term loans \| Interest Rate Swap Six
Line of Credit Facility [Line Items]
Interest rate (percent)	2.70%
5.5 year - variable rate \| Term loans
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 200,000,000.0
Debt instrument, term	5 years 6 months
Unsecured term loans	$ 100,000,000
Interest rate (percent)	1.286%
5.5 year - variable rate \| Term loans \| Interest Rate Swap One \| One-month LIBOR
Line of Credit Facility [Line Items]
Variable rate (percent)			1.20%
Unsecured Term Loan \| Term loans
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 400,000,000
Unsecured term loans	$ 400,000,000
Issuance costs, net of accumulated amortization	(3,717,000)
Total mortgages payable, net	$ 396,283,000