DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2018
Debt Instrument [Line Items]
Carrying principal value	$ 651,455	$ 648,474	$ 706,140
Weighted average maturity in years	6 years 7 days
Mortgages
Debt Instrument [Line Items]
Weighted average interest rate	4.02%	4.58%	4.69%
Unsecured Debt
Debt Instrument [Line Items]
Carrying principal value	$ 320,079	$ 202,500	$ 194,000
Weighted average maturity in years	6 years 3 months 7 days
Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Carrying principal value	$ 50,079	$ 57,500	$ 124,000
Weighted average maturity in years	2 years 8 months 1 day
Unsecured Debt | Line of Credit | Lines of credit (rate with swap)
Debt Instrument [Line Items]
Weighted average interest rate	3.81%	3.72%	3.35%
Unsecured Debt | Term Loans
Debt Instrument [Line Items]
Carrying principal value	$ 145,000	$ 145,000	$ 70,000
Weighted average maturity in years	4 years 10 months 17 days
Weighted average interest rate	4.11%	4.01%	3.86%
Unsecured Debt | Unsecured Senior Notes
Debt Instrument [Line Items]
Carrying principal value	$ 125,000	$ 0	$ 0
Weighted average maturity in years	9 years 3 months 29 days
Weighted average interest rate	3.78%	0.00%	0.00%
Secured Debt | Mortgages payable - fixed
Debt Instrument [Line Items]
Carrying principal value	$ 331,376	$ 445,974	$ 489,401
Weighted average maturity in years	5 years 9 months 14 days
Secured Debt | Mortgage payable - variable
Debt Instrument [Line Items]
Carrying principal value	$ 0	$ 0	$ 22,739