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FAIR VALUE MEASUREMENTS - Effect of derivatives on Consolidated Statements of Income (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) property	Sep. 30, 2020 USD ($) property	Dec. 31, 2020 USD ($)
FAIR VALUE MEASUREMENTS
Amount of (loss) gain recognized on derivatives in other comprehensive loss	$ (31,000)	$ (31,000)	$ 722,000	$ (5,672,000)
Amount of reclassification from Accumulated other comprehensive loss into Interest expense	(348,000)	(425,000)	$ (1,937,000)	$ (1,677,000)
Number of Properties Sold | property			3	3
Interest rate swap | Prepayment costs on debt
FAIR VALUE MEASUREMENTS
Amounts reclassified from Accumulated other comprehensive loss into Interest Expense as a result of forecasted transactions being no longer probable of occurring	24,000	58,000	$ 808,000	$ 1,123,000
Interest rate swap | Cash flow hedges
FAIR VALUE MEASUREMENTS
Reclassification of realized gain (loss) from Accumulated other comprehensive income (loss) to earnings	0	$ 0	0	$ 0
Additional amount to be reclassified during the next twelve months			(1,206,000)
Credit risk related contingent feature
Accrued interest on derivatives in a liability position	85,000		85,000		$ 120,000
Fair value of derivative in a liability position, including accrued interest but excluding adjustments for non-performance risk	2,495,000		2,495,000		5,314,000
Termination liability value	2,495,000		2,495,000		5,314,000
Interest rate swap | Cash flow hedges | Accrued Expenses And Other Liabilities [Member]
Credit risk related contingent feature
Adjustments for non-performance risk	$ 58,000		$ 58,000		$ 182,000

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The amount of adjustments for non-performance risk as applicable to the termination value of derivatives in a liability position.

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The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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