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LEASES - As Lessor (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessor
Operating Lease, option to extend									true
Operating Lease, option to terminate									true
Practical expedient, single lease component	true								true
Components of lease revenues
Fixed lease revenues									$ 70,788,000	$ 65,042,000	$ 63,425,000
Variable lease revenues									12,084,000	11,863,000	11,594,000
Lease revenues									82,872,000	76,905,000	75,019,000
Amortization of intangibles relating to leases, net									914,000	1,849,000	897,000
Revenues	$ 22,448,000	$ 20,414,000	$ 20,719,000	$ 21,155,000	$ 20,270,000	$ 19,570,000	$ 19,752,000	$ 19,534,000	84,736,000	79,126,000	75,916,000
Rental income, net
Components of lease revenues
Revenues									83,786,000	78,754,000	75,916,000
Tenant reimbursements
Components of lease revenues
Revenues									10,443,000	8,456,000	7,672,000
ASU 2016-02 | Adjustment | Tenant reimbursements
Components of lease revenues
Revenues									$ 10,443,000	$ 8,456,000	$ 7,672,000

X

- Definition

Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

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Indicates (true false) whether practical expedient is elected to account for lease component and nonlease component as single lease component.

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Indicates (true false) whether lessor has option to extend operating lease.

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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