VARIABLE INTEREST ENTITIES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Loan	Dec. 31, 2018 USD ($) Loan	Jan. 11, 2019 USD ($)	Mar. 31, 2017 USD ($)
Variable Interest Entity [Line Items]
Debt Commitment	$ 894,744
Carrying Amount	$ 1,682,498	$ 1,524,873
Floating Rate Notes, Weighted Average Coupon Rate, LIBOR Plus 1.85%
Variable Interest Entity [Line Items]
Number of properties collateralized for mortgage loan | Loan	16	11
Collateral amount	$ 515,900	$ 289,600
Receivables related to repayments of outstanding principal	$ 41,100	$ 51,600
Offered Certificates
Variable Interest Entity [Line Items]
Prepayment fee, percent	1.00%
Offered Notes
Variable Interest Entity [Line Items]
Prepayment fee, percent	1.00%
Parent Company | Offered Certificates
Variable Interest Entity [Line Items]
Preferred equity fully funded amount	$ 52,900
Parent Company | Secured funding agreements
Variable Interest Entity [Line Items]
Carrying Amount	111,400
Holdco | Offered Notes
Variable Interest Entity [Line Items]
Principal amount of certificates retained by wholly owned subsidiary of the entity	58,500
Wells Fargo Bank National Association
Variable Interest Entity [Line Items]
Debt Commitment	$ 360,354
Notes Payable to Banks | Wells Fargo Bank National Association
Variable Interest Entity [Line Items]
Debt Commitment				$ 308,800
Notes Payable to Banks | Wells Fargo Bank National Association | 2019 FL3 CLO Securitization
Variable Interest Entity [Line Items]
Debt Commitment			$ 504,100
Wells Fargo Bank National Association
Variable Interest Entity [Line Items]
Debt instrument, preferred equity component				$ 32,400