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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Unfunded Loan Commitments
Tenant reimbursements	$ 1.6	$ 3.6
Provision for loan losses
Unfunded Loan Commitments
Unfunded commitments of mortgage loan receivables held for investment	375.9			$ 379.8
Accounting Standards Update 2016-02
Unfunded Loan Commitments
Operating lease liability	3.3		$ 3.5
Operating lease, right-of-use asset	$ 3.2		$ 3.3

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Tenant Recoveries

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- Definition

The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Present value of lessee's discounted obligation for lease payments from operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
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Amount of lessee's right to use underlying asset under operating lease.

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