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MORTGAGE LOAN RECEIVABLES - Schedule of Mortgage Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | $ 3,608,726 | $ 3,400,345 |  |
Current expected credit losses | (49,457) | (20,500) |  |
Carrying Value | $ 3,530,035 | $ 3,358,861 |  |
Weighted average yield | 6.84% | 6.88% |  |
Remaining Maturity | 1 year 7 months 28 days | 1 year 9 months |  |
First mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | $ 3,330,918 | $ 3,147,275 |  |
Carrying Value gross, consumer and commercial real estate | $ 3,310,167 | $ 3,127,173 |  |
Weighted average yield | 6.72% | 6.77% |  |
Remaining Maturity | 1 year 2 months 19 days | 1 year 4 months 6 days |  |
Mezzanine loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | $ 122,975 | $ 130,322 |  |
Carrying Value gross, consumer and commercial real estate | $ 122,612 | $ 129,863 |  |
Weighted average yield | 10.84% | 10.97% |  |
Remaining Maturity | 3 years 1 month 28 days | 3 years 3 months 3 days |  |
Total 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 | $ 3,453,893 | $ 3,277,597 |  |
Carrying Value gross, consumer and commercial real estate | $ 3,432,779 | $ 3,257,036 |  |
Weighted average yield | 6.86% | 6.94% |  |
Remaining Maturity | 1 year 3 months 14 days | 1 year 5 months 4 days |  |
Total 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 | $ 3,453,893 | $ 3,277,597 |  |
Current expected credit losses | (49,457) | (20,500) | $ (18,200) | $ (17,900)
Carrying Value | 3,383,322 | 3,236,536 |  |
Mortgage loan receivables held for sale, First Mortgage Loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | 154,833 | 122,748 |  |
Carrying Value | $ 146,713 | $ 122,325 |  |
Weighted average yield | 3.94% | 4.20% |  |
Remaining Maturity | 9 years 11 months 15 days | 9 years 11 months 26 days |  |

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