FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
FINANCIAL LIABILITIES
Unsecured senior notes	$ 299,412	$ 399,007
Mortgages payable	921,659
Carrying Amount
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	8,939	10,458
FINANCIAL LIABILITIES
Revolving lines of credit	143,469	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	279,340	299,427
Carrying Amount | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	48,903	1,433
Fair Value
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	8,939	10,458
FINANCIAL LIABILITIES
Revolving lines of credit	143,469	113,500
Term loans	0	100,000
Unsecured senior notes	245,627	238,446
Fair Value | Mortgages | Mortgages payable - Fannie Mae
FINANCIAL LIABILITIES
Mortgages payable	164,227	161,297
Fair Value | Mortgages | Mortgages payable - other
FINANCIAL LIABILITIES
Mortgages payable	258,799	274,029
Fair Value | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	$ 48,903	$ 1,433