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MORTGAGE LOAN RECEIVABLES - Individually Impaired Loans (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) loan | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | $ 3,453,892 | $ 3,453,892 |  |  |
Subtotal loans |  | 3,372,576 | 3,372,576 |  |  |
Individually impaired loans |  | 81,316 | 81,316 |  |  |
2019 |  | 291,604 | 291,604 |  |  |
2018 |  | 1,319,593 | 1,319,593 |  |  |
2017 |  | 1,020,543 | 1,020,543 |  |  |
2016 |  | 322,563 | 322,563 |  |  |
Prior to 2016 |  | 418,273 | 418,273 |  |  |
Total mortgage loan receivables held for investment, net, at amortized cost |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Loans in default, carrying value |  | 61,500 | $ 61,500 |  | $ 45,000 |
One Company Loan | Total mortgage loan receivables held for investment, net, at amortized cost |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Number or loans in default | 1 |  | 1 | 1 | 1 | 1
Loans in default, carrying value | $ 5,900 | $ 4,100 | $ 4,100 |  | $ 4,100 | $ 5,900
Two Company Loans | Total mortgage loan receivables held for investment, net, at amortized cost |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Number or loans in default |  | 2 | 2 |  | 2 |
Loans in default, carrying value |  | $ 26,900 | $ 26,900 | $ 26,900 | $ 46,400 |
Northeast |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 966,468 | 966,468 |  |  |
Southwest |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 660,635 | 660,635 |  |  |
Midwest |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 640,633 | 640,633 |  |  |
South |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 547,812 | 547,812 |  |  |
West |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 557,028 | 557,028 |  |  |
Multifamily |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 1,046,253 | 1,046,253 |  |  |
Office |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 854,808 | 854,808 |  |  |
Hospitality |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 386,487 | 386,487 |  |  |
Mixed Use |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 423,002 | 423,002 |  |  |
Retail |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 247,958 | 247,958 |  |  |
Other |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 105,879 | 105,879 |  |  |
Industrial |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 174,098 | 174,098 |  |  |
Manufactured Housing |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | 82,666 | 82,666 |  |  |
Self-Storage |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Total loans |  | $ 51,425 | $ 51,425 |  |  |

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