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MORTGAGE LOAN RECEIVABLES - Activity in Loan Portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |
Loans and Leases Receivable, Allowance | [1] | $ 18,200 |  | $ 17,900 |
Sale of loans, net |  | (7,079) | $ (4,888) |  |
Provision for loan and lease losses |  | (300) | (3,000) |  |
Loans held for sale transferred loan held for investment, book value |  | 15,400 | 57,600 |  |
Combined book value |  | $ 15,500 | $ 55,400 |  |
Remaining maturity |  | 9 years 9 months 10 days | 2 years 6 months |  |
Reduction in proceeds from sales of real estate |  | $ 0 | $ 11,050 |  |
Mortgage Loans Held By Consolidated Subsidiaries |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |
Mortgage loans held by consolidated subsidiaries, beginning balance |  | 3,318,390 | 3,282,462 |  |
Origination of mortgage loan receivables |  | 224,418 | 434,632 |  |
Proceeds from sales of mortgage loan receivables |  | (245,444) | (249,105) |  |
Transfer between held for investment and held for sale |  | 15,504 | (55,403) |  |
Accretion/amortization of discount, premium and other fees |  | 5,389 | 4,794 |  |
Mortgage loans held by consolidated subsidiaries, ending balance |  | 3,302,753 | 3,528,186 |  |
Mortgage loan receivables held for investment, net, at amortized cost |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 18,200 | 7,000 | $ 17,900 | $ 4,000
Loan loss provision |  |  | (3,000) |  |
Provision for loan and lease losses |  | (300) |  |  |
Mortgage loan receivables held for sale |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |
Mortgage loans held by consolidated subsidiaries, beginning balance |  | 182,439 | 230,180 |  |
Origination of mortgage loan receivables |  | 175,256 | 532,878 |  |
Proceeds from sales of mortgage loan receivables |  | (321) | (133) |  |
Proceeds from sales of mortgage loan receivables |  | 159,424 | 438,774 |  |
Sale of loans, net |  | (7,079) | (4,888) |  |
Transfer between held for investment and held for sale |  | (15,504) | 55,403 |  |
Mortgage loans held by consolidated subsidiaries, ending balance |  | $ 189,525 | 273,636 |  |
Repayment of mortgage loans receivable held for sale |  |  | 54,800 |  |
Reduction in proceeds from sales of real estate |  |  | 11,100 |  |
Realized losses on loans |  |  | $ 500 |  |
[1] | Includes amounts relating to consolidated variable interest entities. See Note 3.

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- Definition Amount of decrease in 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, from collection of principal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -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(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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