DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Carrying principal balance	$ 696,264	$ 648,474
Weighted Average Maturity in Years at March 31, 2019	4 years 3 months 25 days
Mortgages payable - fixed
Debt Instrument [Line Items]
Carrying principal balance	$ 432,587	$ 445,974
Weighted Average Maturity in Years at March 31, 2019	4 years 1 month 28 days
Mortgages
Debt Instrument [Line Items]
Weighted average interest rate	4.54%	4.58%
Unsecured Debt
Debt Instrument [Line Items]
Carrying principal balance	$ 248,677	$ 202,500
Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Carrying principal balance	$ 103,677	57,500
Weighted Average Maturity in Years at March 31, 2019	3 years 3 months 25 days
Unsecured Debt | Term Loans
Debt Instrument [Line Items]
Carrying principal balance	$ 145,000	$ 145,000
Weighted Average Maturity in Years at March 31, 2019	5 years 7 months 10 days
Weighted average interest rate	3.99%	4.01%
Secured Debt | Line of Credit
Debt Instrument [Line Items]
Carrying principal balance	$ 15,000	$ 0
Weighted Average Maturity in Years at March 31, 2019	3 years 5 months 1 day
Primary Line Of Credit | Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate	3.90%	3.72%
Operating Line Of Credit | Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate	4.40%	0.00%