DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Carrying principal balance	$ 735,874	$ 648,474
Weighted Average Maturity in Years at September 30, 2019	5 years 10 months 24 days
Mortgages
Debt Instrument [Line Items]
Carrying principal balance	$ 362,731	$ 445,974
Weighted Average Maturity in Years at September 30, 2019	5 years 8 months 12 days
Weighted average interest rate	4.15%	4.58%
Unsecured Debt
Debt Instrument [Line Items]
Carrying principal balance	$ 373,143	$ 202,500
Weighted Average Maturity in Years at September 30, 2019	6 years
Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Carrying principal balance	$ 103,143	57,500
Weighted Average Maturity in Years at September 30, 2019	2 years 10 months 24 days
Unsecured Debt | Term Loans
Debt Instrument [Line Items]
Carrying principal balance	$ 145,000	$ 145,000
Weighted Average Maturity in Years at September 30, 2019	5 years 1 month 6 days
Weighted average interest rate	4.14%	4.01%
Unsecured Debt | Unsecured senior notes
Debt Instrument [Line Items]
Carrying principal balance	$ 125,000	$ 0
Weighted Average Maturity in Years at September 30, 2019	9 years 7 months 6 days
Weighted average interest rate	3.78%	0.00%
Unsecured Debt | Primary Line Of Credit | Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate	3.73%	3.72%