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Debt - Line of Credit (Details)	6 Months Ended
Debt - Line of Credit (Details)	Jun. 30, 2021 USD ($) swap	Jun. 01, 2021	Dec. 31, 2020 USD ($)	Dec. 01, 2020
Line of Credit Facility [Line Items]
Number of interest rate swaps \| swap	4
Number of interest rate swaps to be terminated \| swap	2
$250.0 million 5 year - swapped to fixed rate \| Term loans \| Interest Rate Swap One
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 250,000,000.0
Debt instrument, term	5 years
Unsecured term loans	$ 100,000,000		$ 100,000,000
Interest rate (percent)	2.6795%		2.6795%
$250.0 million 5 year - swapped to fixed rate \| Term loans \| Interest Rate Swap Two
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 250,000,000.0
Debt instrument, term	5 years
Unsecured term loans	$ 100,000,000		$ 100,000,000
Interest rate (percent)	2.6795%		2.6795%
$250.0 million 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
$250.0 million 5 year - variable rate \| Term loans
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 250,000,000.0
Debt instrument, term	5 years
Unsecured term loans	$ 50,000,000		$ 50,000,000
Interest rate (percent)	1.2921%		1.3548%
$250.0 million 5 year - variable rate \| Term loans \| Interest Rate Swap One \| One-month LIBOR
Line of Credit Facility [Line Items]
Variable rate (percent)		1.20%		1.20%
$150.0 million 5.5 year - swapped to fixed rate \| Term loans
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 150,000,000.0
Debt instrument, term	5 years 6 months
Unsecured term loans	$ 50,000,000		$ 50,000,000
Interest rate (percent)	2.6915%		2.6915%
$150.0 million 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
$150.0 million 5.5 year - swapped to fixed rate \| Term loans
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 150,000,000.0
Debt instrument, term	5 years 6 months
Unsecured term loans	$ 50,000,000		$ 50,000,000
Interest rate (percent)	2.699%		2.699%
$150.0 million 5.5 year - swapped to fixed rate \| Term loans \| Interest Rate Swap Six
Line of Credit Facility [Line Items]
Interest rate (percent)	2.70%
$150.0 million 5.5 year - variable rate \| Term loans
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 150,000,000.0
Debt instrument, term	5 years 6 months
Unsecured term loans	$ 50,000,000		$ 50,000,000
Interest rate (percent)	1.2921%		1.3548%
Unsecured Term Loan \| Term loans
Line of Credit Facility [Line Items]
Unsecured term loans	$ 400,000,000		$ 400,000,000
Issuance costs, net of accumulated amortization	(1,325,000)		(1,619,000)
Total mortgages payable, net	$ 398,675,000		$ 398,381,000