LOANS HELD FOR INVESTMENT - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) Loan
Receivables [Abstract]
Number of loans originated or co-originated | Loan	38
Number of loans repaid or sold | Loan	50
Total Commitment	$ 1,800.0
Loans held for investment	1,700.0
Amount funded	421.8
Amount of repayments	$ 81.7
Percentage of loans held for investment having LIBOR floors	89.00%
Weighted average floor (as a percent)	0.56%