FAIR VALUE DISCLOSURES - Narrative (Details) - Discount Rate	Mar. 31, 2020
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input	0.06
Preferred equity investments, measurement input	0.12
Minimum | Secured Indebtedness
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt, measurement input	0.03
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input	0.25
Preferred equity investments, measurement input	0.15
Maximum | Secured Indebtedness
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt, measurement input	0.04
Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input	0.15
Preferred equity investments, measurement input	0.12
Weighted Average | Secured Indebtedness
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt, measurement input	0.03