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LOANS - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Jan. 01, 2020 | Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Assets | $ 96,917,274,000 |  | $ 130,295,081,000 | [1] |  |
Loan loss provision recorded during period | 99,326,000 | $ 5,703,000 |  |  |  |
Allowance for loan loss | 137,900,000 |  | 20,100,000 |  |  |
Commercial Mortgage Loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loan loss provision recorded during period | 52,100,000 |  | 5,700,000 |  |  |
Principal balance | 106,200,000 |  | 36,600,000 |  |  |
Carrying value | 48,300,000 |  | 30,900,000 |  |  |
Unfunded commitments | $ 140,900,000 |  | $ 181,400,000 |  |  |
Loans receivable with variable rates of interest | 94.00% |  | 92.00% |  |  |
Commercial Mortgage Loans | Impact of adopting CECL |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Allowance for loan loss |  |  |  |  | $ 7,800,000 |
Commercial Mortgage Loans | CECL provision, adjusted balance |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Allowance for loan loss | $ 23,200,000 |  |  |  |  |
Residential Mortgage Loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Assets | 1,300,000,000 |  | $ 1,600,000,000 |  |  |
Loans | $ 57,800,000 |  | $ 66,700,000 |  |  |
Percent of adjustable-rate loans | 33.00% |  | 36.00% |  |  |
Corporate Loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loan loss provision recorded during period | $ 10,000,000.0 | $ 0 |  |  |  |
Loans | 2,150,263,000 |  | $ 2,144,850,000 |  |  | $ 1,887,182,000
Principal balance | 29,300,000 |  |  |  |  |
Carrying value | 21,900,000 |  |  |  |  |
Debt | 4,800,000 |  |  |  |  |
Allowance for loan losses, writeoffs | 11,900,000 |  |  |  |  |
Unfunded commitments | 79,500,000 |  | 81,200,000 |  |  |
Corporate Loans | Impact of adopting CECL |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Allowance for credit loss |  |  |  |  | $ 29,700,000 |
Corporate Loans | CECL provision, adjusted balance |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans |  |  | 2,152,213,000 |  |  |
Allowance for credit loss | $ 14,100,000 |  |  |  |  |
Minimum |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Senior secured loans, stated maturity | 5 years |  |  |  |  |
Maximum |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Senior secured loans, stated maturity | 7 years |  |  |  |  |
First lien loans | Corporate Loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans | $ 1,496,887,000 |  | 1,396,140,000 |  |  | 1,346,356,000
Allowance for loan losses, writeoffs | 19,600,000 |  |  |  |  |
First lien loans | Corporate Loans | CECL provision, adjusted balance |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans |  |  | 1,403,503,000 |  |  |
Second lien loans | Corporate Loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans | 653,376,000 |  | 748,710,000 |  |  | $ 540,826,000
Debt | $ 2,800,000 |  |  |  |  |
Second lien loans | Corporate Loans | CECL provision, adjusted balance |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans |  |  | $ 748,710,000 |  |  |
[1] | Derived from the audited consolidated financial statements at December 31, 2019.

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