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MORTGAGE LOAN RECEIVABLES - Schedule of Mortgage Loans (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount		$ 3,526,512	$ 3,522,286
Provision for loan losses	[1]	(18,200)	(17,900)
Mortgage loan receivables held for investment, net, at amortized cost		3,526,512
Carrying Value		$ 3,489,582	$ 3,482,929
Weighted Average Yield		7.57%	7.76%
Remaining Maturity (years)		1 year 8 months 8 days	1 year 9 months 7 days
Loans held for sale transferred loan held for investment, book value		$ 15,400		$ 57,600
Carrying value		15,500
Mortgage Loans Held By Consolidated Subsidiaries
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount		3,321,828	$ 3,340,381
Carrying Value gross, consumer and commercial real estate		$ 3,302,753	$ 3,318,390
Weighted Average Yield		7.68%	7.84%
Remaining Maturity (years)		1 year 2 months 12 days	1 year 3 months 25 days
Mortgage loans transferred but not considered sold
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount		$ 15,350	$ 0
Carrying Value gross, consumer and commercial real estate		$ 15,504
Weighted Average Yield		5.29%
Remaining Maturity (years)		9 years 9 months 10 days
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]
Outstanding Face Amount		$ 3,337,178	3,340,381
Provision for loan losses		(18,200)	(17,900)	$ (7,000)	$ (4,000)
Mortgage loan receivables held for investment, net, at amortized cost		3,337,178
Carrying Value		3,300,057	3,300,490
Mortgage loan receivables held for sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount		189,334	181,905
Mortgage loan receivables held for investment, net, at amortized cost		189,334
Carrying Value		$ 189,525	$ 182,439
Weighted Average Yield		5.53%	5.46%
Remaining Maturity (years)		9 years 6 months 21 days	9 years 9 months
[1] Includes amounts relating to consolidated variable interest entities. See Note 3.

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- Definition

Loans Held-for-sale Transferred to Portfolio Loans, Carrying Amount

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Loans Held-for-sale Transferred to Portfolio Loans, Carrying Value

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- Definition

Amount of the contractual principal due as of the balance sheet date of the mortgage loan (face amount).

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- Definition

Represents the remaining maturity period of mortgage loans.

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Mortgage Loans on Real Estate, Gross, Commercial and Consumer, After Provision for Loan Losses

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Mortgage Loans on Real Estate, Gross, Commercial and Consumer, Net

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Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column B
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column B))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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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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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Section 50
-Paragraph 11B
-Subparagraph (g)
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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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-Publisher FASB
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