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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
FINANCIAL LIABILITIES
Unsecured senior notes	$ 299,359	$ 299,344
Mortgages payable	870,963
Carrying Amount
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	13,313	31,267
FINANCIAL LIABILITIES
Revolving lines of credit	46,000	76,000
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	326,113	284,934
Carrying Amount | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	2,409	7,358
Fair Value
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	13,313	31,267
FINANCIAL LIABILITIES
Revolving lines of credit	46,000	76,000
Unsecured senior notes	273,973	308,302
Fair Value | Mortgages | Mortgages payable - Fannie Mae
FINANCIAL LIABILITIES
Mortgages payable	176,055	198,850
Fair Value | Mortgages | Mortgages payable - other
FINANCIAL LIABILITIES
Mortgages payable	308,363	284,546
Fair Value | Restricted cash
FINANCIAL ASSETS
Cash and cash equivalents and restricted cash	$ 2,409	$ 7,358

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Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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