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Fair Value Measurements - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($) property	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of retail properties impaired | property				1
Provision for asset impairment	$ 0	$ 0	$ 0	$ 9,002,000
Mortgages payable | Weighted Average Effective Market Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input (percent)	0.0443		0.0443		0.0425
Line of Credit | Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement input (percent)	0.0216		0.0216		0.0136
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements	$ 0		$ 0
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements		$ 0		$ 0

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- Definition

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+ References

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- Definition

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+ References

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

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