SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 14, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Subsequent Event [Line Items]
Provision for (recovery of) credit losses, net		$ 2,598	$ 0	$ 1,463	$ (175)
Mortgage Receivable
Subsequent Event [Line Items]
Mortgage loans, net				$ 11,700		$ 23,200
Subsequent Event
Subsequent Event [Line Items]
Provision for (recovery of) credit losses, net	$ 2,600
Subsequent Event | Juniper New Mexico, LLC | Real Estate Loan
Subsequent Event [Line Items]
Commitment funded	1,000
Subsequent Event | Mortgage Receivable | Mezzanine Loan
Subsequent Event [Line Items]
Mortgage loans, net	$ 12,300