DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying principal balance	$ 796,545	$ 721,316
Weighted Average Maturity in Years at March 31, 2021	4 years 8 months 8 days
Weighted average interest rate	3.37%	3.62%
Mortgages
Debt Instrument [Line Items]
Carrying principal balance	$ 295,001	$ 298,445
Weighted Average Maturity in Years at March 31, 2021	5 years 10 days
Weighted average interest rate	3.92%	3.93%
Unsecured Debt
Debt Instrument [Line Items]
Carrying principal balance	$ 501,544	$ 422,871
Weighted Average Maturity in Years at March 31, 2021	4 years 5 months 26 days
Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Carrying principal balance	$ 181,544	152,871
Weighted Average Maturity in Years at March 31, 2021	1 year 4 months 28 days
Unsecured Debt | Term Loans
Debt Instrument [Line Items]
Carrying principal balance	$ 145,000	$ 145,000
Weighted Average Maturity in Years at March 31, 2021	3 years 7 months 20 days
Weighted average interest rate	4.11%	4.15%
Unsecured Debt | Unsecured senior notes
Debt Instrument [Line Items]
Carrying principal balance	$ 175,000	$ 125,000
Weighted Average Maturity in Years at March 31, 2021	8 years 4 months 24 days
Weighted average interest rate	3.47%	3.78%
Unsecured Debt | Primary Line Of Credit | Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate	2.18%	2.85%