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INVESTMENTS - Jocassee Partners LLC (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | May 08, 2019 | May 07, 2019
Schedule of Investments [Line Items] |  |  |  |  |
Committed investment amount | $ 418,996,000 |  | $ 388,772,000 |  |
Total dividend income | 10,742,000 | $ 8,477,000 |  |  |
Fair Value | 2,571,228,000 |  | 2,449,272,000 |  |
Cost | 2,610,675,000 |  | 2,522,696,000 |  |
Borrowings under credit facility | 497,268,000 |  | 438,590,000 |  |
Repayments received / sales of portfolio investments | 122,362,000 | 118,008,000 |  |  |
Jocassee Partners LLC |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Repayments received / sales of portfolio investments | 1,063,300,000 |  | 1,063,300,000 |  |
Due from related parties | 0 |  | 0 |  |
Jocassee Partners LLC | Subscription Facility | Bank Of America Subscription Facility | Line of Credit |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Borrowings under credit facility | 176,800,000 |  | 173,500,000 |  |
Jocassee Partners LLC | Subscription Facility | Citibank N.A. Subscription Facility | Line of Credit |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Borrowings under credit facility | 173,300,000 |  | 266,700,000 |  |
Jocassee Partners LLC | Subscription Facility | Term Debt Securitization | Line of Credit |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Borrowings under credit facility | 323,800,000 |  | 323,700,000 |  |
Jocassee Partners LLC |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Dividends | 15,700,000 | 15,700,000 |  |  |
Total dividend income | 1,400,000 | $ 1,400,000 |  |  |
Fair Value | 1,081,889,000 |  | 1,095,308,000 |  |
Cost | $ 1,140,101,000 |  | $ 1,158,999,000 |  |
Interest-earning assets, average yield | 8.90% |  | 9.20% |  |
Jocassee Partners LLC | Long-Term Investments |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fair Value | $ 1,081,900,000 |  | $ 1,095,300,000 |  |
Cost | $ 1,140,100,000 |  | $ 1,159,000,000 |  |
Jocassee Partners LLC | SCRS |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Committed investment amount |  |  |  | $ 500,000,000 | $ 100,000,000

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