FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
FINANCIAL LIABILITIES
Unsecured senior notes	$ 299,443	$ 399,007
Mortgages payable	842,559
Carrying Amount
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	29,701	10,458
FINANCIAL LIABILITIES
Revolving lines of credit	0	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	343,709	299,427
Carrying Amount | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	22,496	1,433
Fair Value
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	29,701	10,458
FINANCIAL LIABILITIES
Revolving lines of credit	0	113,500
Term loans	0	100,000
Unsecured senior notes	234,675	238,446
Fair Value | Mortgages | Mortgages payable - Fannie Mae
FINANCIAL LIABILITIES
Mortgages payable	157,180	161,297
Fair Value | Mortgages | Mortgages payable - other
FINANCIAL LIABILITIES
Mortgages payable	306,678	274,029
Fair Value | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	$ 22,496	$ 1,433