INVESTMENT IN UNCONSOLIDATED AFFILIATES - Summary of financial position (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
ASSETS
Real estate investments	$ 1,092,640			$ 970,804
Accumulated depreciation	(231,131)			(214,584)
Total real estate investments, net	861,509			756,220
Cash and cash equivalents	11,145			26,919	$ 17,896
Restricted deposits	9,781			10,142	9,294
Other assets, net	21,189			21,515
Total Assets	944,921			854,833
LIABILITIES
Tenant security deposits payable	8,413			7,104
Accrued expenses and other liabilities	21,522			19,239
Total Liabilities	635,542			553,513
SHAREHOLDERS' EQUITY
Total Shareholders' Equity	309,379	$ 311,668	$ 300,108	301,320	$ 311,913	$ 312,353	$ 314,037	$ 323,466
Total liabilities and shareholders' equity	944,921			854,833
Unconsolidated affiliates
ASSETS
Real estate investments	301,157			261,901
Accumulated depreciation	(34,167)			(26,191)
Total real estate investments, net	266,990			235,710
Cash and cash equivalents	3,112			3,388
Restricted deposits	1,553			883
Financing and lease costs, net	881			813
Other assets, net	1,055			780
Total Assets	273,591			241,574
LIABILITIES
Mortgage notes payable, net	218,731			191,890
Tenant security deposits payable	451			340
Accrued expenses and other liabilities	6,913			7,208
Total Liabilities	226,095			199,438
SHAREHOLDERS' EQUITY
Total Shareholders' Equity	47,496			42,136
Total liabilities and shareholders' equity	$ 273,591			$ 241,574