INVESTMENT IN UNCONSOLIDATED AFFILIATES - Summary of financial position (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
ASSETS
Real estate investments	$ 971,483		$ 971,148
Accumulated depreciation	(205,653)		(194,849)
Total real estate investments, net	765,830		776,299
Cash and cash equivalents	6,182		3,257	$ 40,072
Restricted deposits	9,093		9,323	8,825
Intangible assets, less accumulated amortization	3,304		5,290
Other assets, net	26,461		27,312
Total Assets	859,908		888,723
LIABILITIES
Tenant security deposits payable	6,954		6,368
Accrued expenses and other liabilities	13,427		16,075
Total Liabilities	547,555		565,257
SHAREHOLDERS' EQUITY
Total Shareholders' Equity	312,353	$ 314,037	323,466	$ 314,224	$ 309,537	$ 295,517
Total liabilities and shareholders' equity	859,908		888,723
Unconsolidated Affiliates
ASSETS
Real estate investments	245,807		218,747
Accumulated depreciation	(21,385)		(16,490)
Total real estate investments, net	224,422		202,257
Cash and cash equivalents	3,130		3,093
Restricted deposits	561		1,034
Intangible assets, less accumulated amortization	858		542
Other assets, net	496		827
Total Assets	229,467		207,753
LIABILITIES
Mortgage notes payable, net	174,782		152,246
Tenant security deposits payable	301		192
Accrued expenses and other liabilities	9,115		8,217
Total Liabilities	184,198		160,655
SHAREHOLDERS' EQUITY
Total Shareholders' Equity	45,269		47,098
Total liabilities and shareholders' equity	$ 229,467		$ 207,753