FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
FINANCIAL LIABILITIES
Unsecured senior notes	$ 299,344	$ 269,246
Mortgages payable	859,784
Amount
FINANCIAL ASSETS
Cash and cash equivalents	31,267	392
FINANCIAL LIABILITIES
Revolving lines of credit	76,000	152,871
Term loans	0	145,000
Unsecured senior notes	300,000	125,000
Amount | Mortgages payable - Fannie Mae credit facility
FINANCIAL LIABILITIES
Mortgages payable	284,934	298,445
Amount | Fannie Mae Credit Facility Agreement | Mortgages payable - Fannie Mae credit facility
FINANCIAL LIABILITIES
Mortgages payable	198,850	0
Amount | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents	7,358	6,918
Fair Value
FINANCIAL ASSETS
Cash and cash equivalents	31,267	392
FINANCIAL LIABILITIES
Revolving lines of credit	76,000	152,871
Term loans	0	145,000
Unsecured senior notes	308,302	133,181
Fair Value | Mortgages payable - Fannie Mae credit facility
FINANCIAL LIABILITIES
Mortgages payable	284,546	308,855
Fair Value | Fannie Mae Credit Facility Agreement | Mortgages payable - Fannie Mae credit facility
FINANCIAL LIABILITIES
Mortgages payable	198,850	0
Fair Value | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents	$ 7,358	$ 6,918