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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (A-H) (Details) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 03, 2024 USD ($) | Aug. 21, 2023 USD ($) | Sep. 23, 2022 USD ($) | Mar. 31, 2024 USD ($) loanReceivable | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2024 USD ($) | Feb. 14, 2024 USD ($) | Dec. 18, 2023 USD ($) | Jan. 12, 2023 USD ($) | Sep. 09, 2022 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value (includes $355,287 and $387,657 from related parties as of March 31, 2024 and December 31, 2023, respectively) |  |  |  | $ 452,496,000 |  | $ 532,419,000 |  |  |  |  |
Number of existing loan receivable | loanReceivable |  |  |  | 2 |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  | $ 452,496,000 |  | 532,419,000 |  |  |  |  |
Loans receivable, fair value disclosure, maximum loss exposure |  |  |  | 330,898,000 |  | 368,074,000 |  |  |  |  |
Advertising costs |  |  |  | 2,410,000 | $ 2,937,000 |  |  |  |  |  |
Restricted cash |  |  |  | 1,889,000 |  | 1,875,000 |  |  |  |  |
Financing receivable, unamortized loan cost (fee) and purchase premium (discount) |  |  |  | 5,226,000 |  | 7,755,000 |  |  |  |  |
Fair value, option, aggregate differences, loans and long-term receivables |  |  |  | 42,234,000 |  | 23,463,000 |  |  |  |  |
Financing receivable, unrealized gain (loss) |  |  |  | (18,771,000) | 43,459,000 |  |  |  |  |  |
Financing receivable, nonaccrual |  |  |  | 0 |  | $ 41,236,000 |  |  |  |  |
Nonaccrual to outstanding, percent |  |  |  |  |  | 7.70% |  |  |  |  |
Financing receivable, 90 days or more past due, still accruing |  |  |  |  |  | $ 43,326,000 |  |  |  |  |
Fair value, option, credit risk, gains (losses) on assets |  |  |  | (11,339,000) | 37,488,000 |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  | 288,436,000 |  | 283,057,000 |  |  |  |  |
Financing receivable, amount exceed fair value |  |  |  | 47,460,000 |  | 31,218,000 |  |  |  |  |
Subsequent Event | Nogin Inc. |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred, loans receivable |  |  |  |  |  |  | $ 37,700,000 |  |  |  |
Payments to acquire businesses, gross | $ 21,300,000 |  |  |  |  |  |  |  |  |  |
Secured Debt | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  |  |  |  |  |  |  |  |  |  | $ 52,500,000
Secured Debt | Term Loan | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 148,200,000 |  | 49,890,000 |  |  |  |  | $ 78,296,000 |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable, historical cost, fair value |  |  |  | 494,730,000 |  | 555,882,000 |  |  |  |  |
Loans receivable |  |  |  | 499,956,000 |  | 563,637,000 |  |  |  |  |
Freedom VCM Holdings, LLC |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  | 15,868,000 |  | $ 20,624,000 |  |  |  |  |
Interest rate |  |  |  |  |  | 12.00% |  |  |  |  |
Dividends paid, equal to the greater of net after-tax proceeds, percentage |  |  |  |  |  | 80.00% |  |  |  |  |
Dividends paid, equal to the greater of gross proceeds, percentage |  |  |  |  |  | 50.00% |  |  |  |  |
Take-private transaction, price |  | $ 227,296,000 |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  | 197,782,000 |  | $ 232,065,000 |  |  |  |  |
Freedom VCM Holdings, LLC | First Priority Security Interest |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  | $ 183,268,000 |  | $ 200,506,000 |  |  |  |  |
Loans receivable, fair value disclosure, loan portfolio percentage |  |  |  | 40.50% |  | 37.70% |  |  |  |  |
Principal amount |  |  |  | $ 200,506,000 |  | $ 200,506,000 |  |  |  |  |
Interest receivable |  |  |  | 14,971,000 |  | 8,889,000 |  |  |  |  |
W.S. Badcock Corporation |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire finance receivables |  | 400,000,000 | $ 168,363,000 |  | 145,278,000 |  |  |  |  |  |
Nogin Inc. |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  | 32,673,000 |  | 17,980,000 |  |  |  |  |
Debtor in possession commitment fund |  |  |  | 33,000,000 |  | 17,530,000 |  |  |  |  |
Financing commitment, additional funds |  |  |  | 15,470,000 |  |  |  |  |  |  |
Nogin Inc. | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Financing commitment, additional funds |  |  |  |  |  |  | 3,000,000 |  |  |  |
Financing commitment, payable in kind fees |  |  |  |  |  |  | $ 1,700,000 |  |  |  |
Financing commitment, payment | $ 15,500,000 |  |  |  |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value (includes $355,287 and $387,657 from related parties as of March 31, 2024 and December 31, 2023, respectively) |  |  |  | 355,287,000 |  | 387,657,000 |  |  |  |  |
Related Party | Freedom VCM Receivables, Inc. |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  | 42,482,000 |  | 42,183,000 |  |  |  |  |
Payments to acquire finance receivables |  | 58,872,000 |  |  |  |  |  |  |  |  |
Gain (loss) on sale of financing receivable |  | $ (78,000) |  |  |  |  |  |  |  |  |
Interest rate |  | 19.74% |  |  |  |  |  |  |  |  |
Retail Industry |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  |  |  | 58,350,000 |  | 62,808,000 |  |  |  |  |
Loans receivable, at fair value |  |  |  | $ 147,630,000 |  | $ 167,568,000 |  |  |  |  |
Loans receivable, fair value disclosure, loan portfolio percentage |  |  |  | 32.60% |  | 31.50% |  |  |  |  |
Retail Industry | Conn’s | Related Party |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value (includes $355,287 and $387,657 from related parties as of March 31, 2024 and December 31, 2023, respectively) |  |  |  |  |  |  |  |  | $ 108,000,000 |  |
Senior notes payable |  |  |  |  |  |  |  | $ 93,000,000 |  |  |
Other fixed income securities |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  | $ 35,383,000 | $ 32,424,000 |  |  |  |  |  |

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