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MORTGAGE LOAN RECEIVABLES - Additional Information (Details) |  |  |  | 3 Months Ended | 12 Months Ended
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Jan. 01, 2020 USD ($) loans $ / shares | Sep. 19, 2018 | Mar. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) loan | Mar. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) loans | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | 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 Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discounts included in mortgage loan receivables held for investment, at amortized cost |  |  |  | $ 400,000 | $ 400,000 | $ 400,000 | $ 400,000 |  |  |  |  |  |  |
General CECL Reserve |  |  |  | 49,457,000 | 49,457,000 | 49,457,000 | 49,457,000 | $ 20,500,000 |  |  |  | $ 20,500,000 |  |
Individually impaired loans |  |  |  | 81,316,000 | 81,316,000 | 81,316,000 | 81,316,000 |  |  |  |  |  |  |
Provision expense for current expected credit loss (implementation impact) |  |  |  |  | 17,993,000 |  |  |  | $ 300,000 |  |  |  |  |
Provision for loan losses |  |  |  |  | 26,581,000 |  |  |  | 300,000 |  |  |  |  |
Loans nonaccrual status, amount |  |  |  | 142,387,000 | 142,387,000 | 142,387,000 | $ 142,387,000 | 98,725,000 |  |  |  | 98,725,000 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct capitalization rate |  |  | 4.70% |  |  |  | 4.60% |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct capitalization rate |  |  | 5.00% |  |  |  | 4.90% |  |  |  |  |  |  |
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 receivable with variable rates of interest |  |  |  | $ 2,800,000,000 | $ 2,800,000,000 | $ 2,800,000,000 | $ 2,800,000,000 | $ 2,500,000,000 |  |  |  | $ 2,500,000,000 |  |
Loans receivable with variable rates of interest |  |  |  | 80.00% | 80.00% | 80.00% | 80.00% | 77.20% |  |  |  | 77.20% |  |
Loans receivable with variable rates of interest, subject to interest rate floors |  |  |  | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  | 100.00% |  |
General CECL Reserve |  |  |  | $ 49,457,000 | $ 49,457,000 | $ 49,457,000 | $ 49,457,000 | $ 20,500,000 | 18,200,000 | $ 17,900,000 |  | $ 20,500,000 | $ 17,900,000 |
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 | $ 61,500,000 |  |  | 45,000,000.0 |  |  | $ 45,000,000.0 |
Total mortgage loan receivables held for investment, net, at amortized cost | Two Company Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 26,900,000 |  | 46,400,000 |  | $ 26,900,000 | $ 46,400,000 |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan reserve amount |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |
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 |  |  | 4,100,000 |  |  | $ 4,100,000 | $ 5,900,000
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan | Series A |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans in default, carrying value |  |  |  |  |  |  |  |  |  | 35,000,000.0 |  |  | 35,000,000.0 |
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan | Series B |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans in default, carrying value |  |  |  |  |  |  |  | 10,400,000 |  | $ 10,000,000.0 |  | $ 10,400,000 | $ 10,000,000.0 |
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity kicker not subject to investment |  |  |  |  |  |  |  |  |  | 19.00% |  |  |  |
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity kicker not subject to investment |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan reserve amount |  |  | $ 2,700,000 |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |
Loans in default, carrying value |  |  |  | 46,400,000 | 46,400,000 | 46,400,000 | 46,400,000 | 61,500,000 |  |  |  | 61,500,000 |  |
Terminal capitalization rate |  | 7.50% |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  | 8.75% |  |  |
Total mortgage loan receivables held for investment, net, at amortized cost | Two Of Company Loans 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans in default, carrying value |  |  |  | 7,700,000 | 7,700,000 | 7,700,000 | 7,700,000 |  |  |  |  |  |  |
Mortgage loan receivables held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable with fixed rates of interest |  |  |  | $ 154,800,000 | $ 154,800,000 | $ 154,800,000 | $ 154,800,000 | $ 122,700,000 |  |  |  | $ 122,700,000 |  |
Percentage of loans receivable with fixed rates of interest |  |  |  | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  | 100.00% |  |
Provision for loan losses |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Loan on non-accrual status |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans nonaccrual status, amount |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
General CECL Reserve | $ 11,600,000 |  |  | 30,200,000 | 30,200,000 | 30,200,000 | 30,200,000 |  |  |  |  |  |  |
Increase of reserve to provision expenses |  |  |  |  | 18,000,000.0 |  |  |  |  |  |  |  |  |
Percentage of total loan portfolio | 0.36% |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of held for investment loan portfolio | $ 3,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Provision expense for current expected credit loss (implementation impact) | $ 5,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of common stock (in usd per share) | $ / shares | $ 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional CECL reserve recorded |  |  |  | $ 18,600,000 | 18,600,000 | $ 18,600,000 | 18,600,000 |  |  |  |  |  |  |
Loans that previously had asset-specific reserves | 3 |  |  | 4 |  | 5 |  |  |  |  |  |  |  |
Increase in reserve of unfunded commitments |  |  |  | $ 600,000 | 600,000 | $ 600,000 | 600,000 |  |  |  |  |  |  |
Accounting Standards Update 2016-13 | Asset Specific Reserve, Company Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
General CECL Reserve | $ 14,700,000 |  |  | $ 20,700,000 | $ 20,700,000 | $ 20,700,000 | $ 20,700,000 |  |  |  |  |  |  |
Carrying value of financing receivable | 39,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of loan specific reserves | $ 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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