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MORTGAGE LOAN RECEIVABLES - Activity in Loan Portfolio (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Allowance for loan losses, beginning balance |  | $ (20,500) |  |  |  |  |  |
Sale of loans, net |  | 1,005 |  | $ 7,079 |  |  |  |
Provision for current expected credit losses |  | (26,581) |  | (300) |  |  |  |
Provision expense for current expected credit loss |  | 17,993 |  | 300 |  |  |  |
Additional asset-specific reserve |  | (8,000) |  |  |  |  |  |
Mortgage loans transferred but not considered sold, at amortized cost, outstanding face amount |  |  |  | 15,400 |  |  |  |
Mortgage loans transferred but not considered sold, at amortized cost, book value |  |  |  | $ 15,500 |  |  |  |
Mortgage loans transferred but not considered sold, at amortized cost, remaining maturity |  |  |  | 9 years 9 months 18 days |  |  |  |
Total 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 receivable, beginning balance |  | 3,257,036 |  | $ 3,318,390 |  | $ 3,318,390 |  |
Origination of mortgage loan receivables |  | 313,936 |  | 224,418 |  |  |  |
Repayment of mortgage loan receivables |  | (118,531) |  | (245,444) |  |  |  |
Proceeds from sales of mortgage loan receivables |  |  |  | 0 |  |  |  |
Non-cash disposition of loans via foreclosure |  | (23,586) |  |  |  |  |  |
Sale of loans, net |  |  |  | 0 |  |  |  |
Transfer between held for investment and held for sale |  |  |  | 0 |  |  |  |
Accretion/amortization of discount, premium and other fees |  | 3,924 |  | 5,389 |  |  |  |
Provision for current expected credit losses |  |  |  | 0 |  |  |  |
Mortgage loans receivable, ending balance |  | 3,432,779 | $ 3,257,036 | 3,302,753 |  | 3,257,036 | $ 3,318,390 |
Mortgage loans transferred but not considered sold |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Transfer between held for investment and held for sale |  |  |  | 15,504 |  |  |  |
Mortgage loans receivable, ending balance |  |  |  | 15,504 |  |  |  |
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] |  |  |  |  |  |  |  |
Loans in default, carrying value |  | 61,500 |  |  |  |  | $ 45,000 |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Allowance for loan losses, beginning balance |  | (20,500) |  | (17,900) |  | (17,900) |  |
Provision for current expected credit losses |  | 2,000 |  |  |  |  |  |
Provision expense for current expected credit loss |  | 4,964 |  |  |  |  |  |
Loan loss provision |  | (17,993) |  | (300) |  |  |  |
Total mortgage loan receivables held for investment, net, at amortized cost | Asset Specific Reserve, Company Loan |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Loans in default, carrying value |  | $ 46,400 | 61,500 |  |  | $ 61,500 |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Loan reserve amount | $ 2,700 |  |  |  | $ 10,000 |  |  |
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Number or loans in default | 1 | 1 |  |  |  | 1 | 1 | 1
Loans in default, carrying value | $ 5,900 | $ 4,100 |  |  |  |  | $ 4,100 | $ 5,900
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Loan reserve amount |  |  | 500 |  |  |  |  |
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 receivable, beginning balance |  | 122,325 |  | 182,439 |  | $ 182,439 |  |
Origination of mortgage loan receivables |  | 212,805 |  | 175,256 |  |  |  |
Repayment of mortgage loan receivables |  | (64) |  | (321) |  |  |  |
Proceeds from sales of mortgage loan receivables |  | (189,358) |  | (159,424) |  |  |  |
Non-cash disposition of loans via foreclosure |  | 0 |  |  |  |  |  |
Sale of loans, net |  | 1,005 |  | 7,079 |  |  |  |
Transfer between held for investment and held for sale |  |  |  | (15,504) |  |  |  |
Accretion/amortization of discount, premium and other fees |  |  |  | 0 |  |  |  |
Provision for current expected credit losses |  |  |  | 0 |  |  |  |
Mortgage loans receivable, ending balance |  | $ 146,713 | $ 122,325 | $ 189,525 |  | $ 122,325 | $ 182,439 |

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