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MORTGAGE LOAN RECEIVABLES - Additional Information (Details)	3 Months Ended			9 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017	Feb. 28, 2019 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unamortized discounts included in mortgage loan receivables held for investment, at amortized cost	$ 500,000	$ 500,000
Provision for loan losses	300,000		$ 3,000,000
Loans nonaccrual status, amount	36,850,000	36,850,000
Real estate acquired through foreclosure						$ 18,200,000
Mortgage loan receivables held for investment, net, at amortized cost
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable with fixed rates of interest	$ 798,700,000	$ 816,800,000
Percentage of loans receivable with fixed rates of interest	24.10%	24.60%
Loans receivable with variable rates of interest	$ 2,500,000,000	$ 2,500,000,000
Loans receivable with variable rates of interest, percentage	75.90%	75.40%
Mortgage loan receivables held for sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable with fixed rates of interest	$ 189,500,000	$ 182,400,000
Percentage of loans receivable with fixed rates of interest	100.00%	100.00%
Loan on non-accrual status
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans nonaccrual status, amount	$ 0	$ 0
Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Direct capitalization rate	4.60%		4.70%		4.35%
Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of mortgage loans impaired | loan	3
Direct capitalization rate	4.90%		5.00%		4.65%
One Of Company Loans | Mortgage loan receivables held for investment, net, at amortized cost
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans in default, carrying value		$ 45,000,000
One Of Company Loans | Minimum | Mortgage loan receivables held for investment, net, at amortized cost
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Percentage of equity kicker not subject to investment		19.00%
One Of Company Loans | Maximum | Mortgage loan receivables held for investment, net, at amortized cost
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Percentage of equity kicker not subject to investment		25.00%
Asset Specific Reserve, Company Loan | Mortgage loan receivables held for investment, net, at amortized cost
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan reserve amount				$ 10,000,000
Two Of Company Loans | Mortgage loan receivables held for investment, net, at amortized cost
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number or loans in default | loan	2
Loans in default, carrying value	$ 26,900,000
Loan reserve amount			$ 2,700,000
Series A | One Of Company Loans | Mortgage loan receivables held for investment, net, at amortized cost
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans in default, carrying value		$ 35,000,000
Series B | One Of Company Loans | Mortgage loan receivables held for investment, net, at amortized cost
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans in default, carrying value		$ 10,000,000
Real Estate Acquired in Satisfaction of Debt
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unamortized discounts included in mortgage loan receivables held for investment, at amortized cost	100,000
Real estate acquired through foreclosure	18,200,000
Loans in default, no losses expected	17,800,000
Accrued interest	$ 200,000

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