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Debt - Narrative (Details)		9 Months Ended		12 Months Ended
	Dec. 21, 2018 USD ($) option	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Debt, net		$ 655,213,000		$ 572,850,000
Repayment of mortgages payable		67,349,000	$ 106,041,000
Mortgages Payable
Debt Instrument [Line Items]
Total mortgages payable, net		107,009,000		175,321,000
Revolving Credit Facility
Debt Instrument [Line Items]
Remaining borrowing capacity		200,000,000
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated
Debt Instrument [Line Items]
Debt, net		150,000,000		$ 150,000,000
Debt instrument, face amount	$ 350,000,000
Proceeds from lines of credit		$ 150,000,000
Debt instrument, term	4 years
Number of extension options | option	2
Extension option on line of credit, period	6 months
Interest rate (percentage)		1.22%		1.22%
Remaining borrowing capacity		$ 0		$ 0
Unused commitment fee (percent)		0.15%		0.15%
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated | One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		1.05%

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Amount of short-term and long-term debt and lease obligation.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit 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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