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Debt - Unsecured Term Loans (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) swap	Dec. 01, 2020	Dec. 31, 2019 USD ($)	Dec. 02, 2019	Dec. 21, 2018 USD ($)
Debt Instrument [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 variable rate 1.3548% | 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	1.3548%
$250.0 million 5 year - swapped to variable rate 2.8911% | Unsecured Debt
Debt Instrument [Line Items]
Unsecured term loans			$ 50,000,000
Stated interest rate			2.8911%
$150.0 million 5.5 year - swapped to fixed rate 2.6915% | 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		$ 50,000,000
Number of interest rate swaps | swap	2
Stated interest rate	2.6915%		2.6915%
$150.0 million 5.5 year - swapped to fixed rate 2.6990% | 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		$ 50,000,000
Stated interest rate	2.699%		2.669%
$150.0 million 5.5 year - swapped to variable rate 1.3548% | 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	1.3548%
$150.0 million 5.5 year - swapped to variable rate 2.8911% | Unsecured Debt
Debt Instrument [Line Items]
Unsecured term loans			$ 50,000,000
Stated interest rate			2.8911%
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	(1,619,000)		(2,471,000)
Total mortgages payable, net	398,381,000		397,529,000
Interest Rate Swap One | $250.0 million 5 year - swapped to fixed rate 2.6795% | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 250,000,000.0
Debt instrument, term	5 years
Unsecured term loans	$ 100,000,000		$ 100,000,000
Stated interest rate	2.6795%		2.6795%
Interest Rate Swap One | $250.0 million 5 year - swapped to variable rate 1.3548% | Unsecured Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate (percent)		1.20%
Interest Rate Swap One | $250.0 million 5 year - swapped to variable rate 2.8911% | Unsecured Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate (percent)				1.20%
Interest Rate Swap Two | $250.0 million 5 year - swapped to fixed rate 2.6795% | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 250,000,000.0
Debt instrument, term	5 years
Unsecured term loans	$ 100,000,000		$ 100,000,000
Notional amount	$ 100,000,000
Stated interest rate	2.6795%		2.6795%
Interest Rate Swap Three | $250.0 million 5 year - swapped to fixed rate 2.6795% | Unsecured Debt
Debt Instrument [Line Items]
Notional amount	$ 50,000,000
Stated interest rate	2.69%
Interest Rate Swap Four [Member] | $250.0 million 5 year - swapped to fixed rate 2.6795% | Unsecured Debt
Debt Instrument [Line Items]
Notional amount	$ 50,000,000
Stated interest rate	2.70%

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