FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
FINANCIAL LIABILITIES
Unsecured senior notes	$ 299,428	$ 399,007
Mortgages payable	885,518
Carrying Amount
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	9,745	10,458
FINANCIAL LIABILITIES
Revolving lines of credit	18,989	113,500
Term loans	0	100,000
Unsecured senior notes	300,000	300,000
Carrying Amount | Mortgages | Mortgages payable - Fannie Mae
FINANCIAL LIABILITIES
Mortgages payable	198,850	198,850
Carrying Amount | Mortgages | Mortgages payable - other
FINANCIAL LIABILITIES
Mortgages payable	367,679	299,427
Carrying Amount | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	566	1,433
Fair Value
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	9,745	10,458
FINANCIAL LIABILITIES
Revolving lines of credit	18,989	113,500
Term loans	0	100,000
Unsecured senior notes	236,283	238,446
Fair Value | Mortgages | Mortgages payable - Fannie Mae
FINANCIAL LIABILITIES
Mortgages payable	163,945	161,297
Fair Value | Mortgages | Mortgages payable - other
FINANCIAL LIABILITIES
Mortgages payable	340,392	274,029
Fair Value | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	$ 566	$ 1,433