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RELATED-PARTY TRANSACTIONS - Sabal Loan (Details) - Loan Purchase Commitments - Limited Liability Company Controlled By Affiliate Of Greater Than 5% Shareholder, Oaktree - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Mar. 31, 2019	Jul. 31, 2018	Jun. 11, 2017	Jun. 26, 2015
Related Party Transaction [Line Items]
Committed revolving repurchase facility					$ 40,000,000	$ 35,000,000
Largest aggregate amount of principal outstanding during period	$ 0	$ 32,500,000
Amount outstanding		0	$ 0	$ 3,500,000
Proceeds from principal	0	210,400,000
Proceeds from interest	$ 0	$ 370,000
Maximum
Related Party Transaction [Line Items]
Committed revolving repurchase facility			$ 100,000,000

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- Definition

The cash inflow from repayments of the balance excluding interest (principal) on loans receivable and leases held for investment purposes.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

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