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MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) loan | Mar. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($)
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Provision for loan losses at beginning of period |  |  | $ 20,500,000 |  | $ 17,900,000 | $ 17,900,000 |  |
Provision expense for current expected credit loss (implementation impact) |  |  | 17,993,000 |  | 300,000 |  |  |
Provision for loan losses |  |  | 26,581,000 |  | 300,000 |  |  |
Additional asset-specific reserve |  |  | 8,000,000 |  | 0 |  |  |
Foreclosure of loans subject to asset-specific reserve |  |  | (2,000,000) |  | 0 |  |  |
Provision for loan losses at end of period |  |  | 49,457,000 |  | 18,200,000 | 20,500,000 | $ 17,900,000 |
Principal balance of loans on non-accrual status |  | $ 142,387,000 | 142,387,000 | $ 142,387,000 |  | 98,725,000 |  |
Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Provision expense for current expected credit loss (implementation impact) |  |  | 4,964,000 |  | $ 0 |  |  |
Total mortgage loan receivables held for investment, net, at amortized cost |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Provision expense for current expected credit loss (implementation impact) |  |  | 4,964,000 |  |  |  |  |
Provision for loan losses |  |  | (2,000,000) |  |  |  |  |
Loans in default, carrying value |  | $ 61,500,000 | 61,500,000 | $ 61,500,000 |  |  | $ 45,000,000.0 |
Total mortgage loan receivables held for investment, net, at amortized cost | Two Company Loans |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Number or loans in default |  | 2 |  | 2 |  |  | 2 |
Loans in default, carrying value |  | $ 26,900,000 | 26,900,000 | $ 26,900,000 |  | $ 26,900,000 | $ 46,400,000 |
Total mortgage loan receivables held for investment, net, at amortized cost | Two Of Company Loans 2 |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Loans in default, carrying value |  | 7,700,000 | 7,700,000 | $ 7,700,000 |  |  |  |
Total mortgage loan receivables held for investment, net, at amortized cost | Two Of Company Loans 1 |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Number or loans in default |  |  |  | 2 |  |  |  |
Loans in default, carrying value |  | 46,400,000 | 46,400,000 | $ 46,400,000 |  |  |  |
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Number or loans in default | 1 |  |  | 1 |  | 1 | 1 | 1
Loans in default, carrying value | $ 5,900,000 | 4,100,000 | 4,100,000 | $ 4,100,000 |  |  | $ 4,100,000 | $ 5,900,000
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan | Series B |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Loans in default, carrying value |  |  |  |  |  | $ 10,400,000 | $ 10,000,000.0 |
Total mortgage loan receivables held for investment, net, at amortized cost | Asset Specific Reserve, Company Loan |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |
Loans in default, carrying value |  | $ 46,400,000 | $ 46,400,000 | $ 46,400,000 |  | $ 61,500,000 |  |

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21338-158488 + Details
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