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RELATED PARTY TRANSACTIONS - Joint Venture Partners and Affiliates (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Unconsolidated Joint Ventures
Related Party Transactions
Payments for property management services	$ 28,000	$ 27,000	$ 88,000	$ 68,000
Decrease in equity earnings, joint venture transaction	14,000	14,000	44,000	34,000
Leasing commission and development fees paid to unconsolidated joint venture partner					$ 75,000
Joint Venture Partners and Affiliates
Related Party Transactions
Payments for property management services	$ 21,000	$ 20,000	$ 59,000	$ 56,000

X

- Definition

Reduction of equity in earnings of unconsolidated joint ventures on the consolidated statement of income.

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X

- Definition

The amount of leasing commissions and development fees paid to an unconsolidated joint venture partner.

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No definition available.

+ Details

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- Definition

Represents the aggregate costs related to management of properties during the reporting period.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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