FAIR VALUE DISCLOSURES - Face Values, Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial assets:
Loans receivable	$ 351,774	$ 352,159
Preferred equity investments	48,575	56,805
Senior Notes
Financial liabilities:
Financial liabilities	1,750,000	1,750,000
Secured Indebtedness
Financial liabilities:
Financial liabilities	50,609	67,602
Carrying Amount
Financial assets:
Loans receivable	341,533	342,031
Preferred equity investments	48,742	57,055
Carrying Amount | Senior Notes
Financial liabilities:
Financial liabilities	1,734,228	1,733,566
Carrying Amount | Secured Indebtedness
Financial liabilities:
Financial liabilities	49,706	66,663
Fair Value
Financial assets:
Loans receivable	344,474	350,107
Preferred equity investments	49,503	57,784
Fair Value | Senior Notes
Financial liabilities:
Financial liabilities	1,449,726	1,808,781
Fair Value | Secured Indebtedness
Financial liabilities:
Financial liabilities	$ 37,815	$ 65,361