DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Carrying principal balance	$ 719,511	$ 651,455
Weighted Average Maturity in Years at September 30, 2020	5 years 2 months 12 days
Weighted average interest rate	3.68%	3.97%
Mortgages
Debt Instrument [Line Items]
Carrying principal balance	$ 314,511	$ 331,376
Weighted Average Maturity in Years at September 30, 2020	5 years 6 months
Weighted average interest rate	3.99%	4.02%
Unsecured Debt
Debt Instrument [Line Items]
Carrying principal balance	$ 405,000	$ 320,079
Weighted Average Maturity in Years at September 30, 2020	5 years
Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Carrying principal balance	$ 135,000	50,079
Weighted Average Maturity in Years at September 30, 2020	2 years 2 months 12 days
Unsecured Debt | Term Loans
Debt Instrument [Line Items]
Carrying principal balance	$ 145,000	$ 145,000
Weighted Average Maturity in Years at September 30, 2020	4 years 4 months 24 days
Weighted average interest rate	4.14%	4.11%
Unsecured Debt | Unsecured senior notes
Debt Instrument [Line Items]
Carrying principal balance	$ 125,000	$ 125,000
Weighted Average Maturity in Years at September 30, 2020	8 years 9 months 18 days
Weighted average interest rate	3.78%	3.78%
Unsecured Debt | Primary Line Of Credit | Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate	3.24%	3.81%