FAIR VALUE DISCLOSURES - Face Values, Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial assets:
Loans receivable	$ 347,693	$ 352,159
Preferred equity investments	57,861	56,805
Senior Notes
Financial liabilities:
Financial liabilities	1,750,000	1,750,000
Secured Indebtedness
Financial liabilities:
Financial liabilities	51,092	67,602
Carrying Amount
Financial assets:
Loans receivable	337,269	342,031
Preferred equity investments	58,073	57,055
Carrying Amount | Senior Notes
Financial liabilities:
Financial liabilities	1,734,008	1,733,566
Carrying Amount | Secured Indebtedness
Financial liabilities:
Financial liabilities	50,177	66,663
Fair Value
Financial assets:
Loans receivable	341,337	350,107
Preferred equity investments	58,866	57,784
Fair Value | Senior Notes
Financial liabilities:
Financial liabilities	1,519,620	1,808,781
Fair Value | Secured Indebtedness
Financial liabilities:
Financial liabilities	$ 41,543	$ 65,361