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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 2,536,315 | [1] | $ 2,449,272 | [2]
Senior debt and 1st lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,785,626 |  | 1,686,411 |
Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 201,371 |  | 165,455 |
Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 33,602 |  | 79,548 |
Equity shares |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 425,580 |  | 409,129 |
Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,068 |  | 2,732 |
Royalty rights |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,581 |  | 5,833 |
Investments subject to leveling |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 2,448,828 |  | 2,349,108 |
Investment in joint ventures |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 87,487 |  |  |
Investment in joint ventures / PE fund |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value |  |  | 100,164 |
Level 1 | Senior debt and 1st lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 1 | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 1 | Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 1 | Equity shares |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 1 | Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 1 | Royalty rights |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 1 | Investments subject to leveling |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 2 | Senior debt and 1st lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 47,559 |  | 60,910 |
Level 2 | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 9,699 |  | 11,752 |
Level 2 | Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 15,825 |  | 30,884 |
Level 2 | Equity shares |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 4,637 |  | 654 |
Level 2 | Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 2 | Royalty rights |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 2 | Investments subject to leveling |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 77,720 |  | 104,200 |
Level 3 | Senior debt and 1st lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,738,067 |  | 1,625,501 |
Level 3 | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 191,672 |  | 153,703 |
Level 3 | Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 17,777 |  | 48,664 |
Level 3 | Equity shares |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 420,943 |  | 408,475 |
Level 3 | Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,068 |  | 2,732 |
Level 3 | Royalty rights |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,581 |  | 5,833 |
Level 3 | Investments subject to leveling |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 2,371,108 |  | $ 2,244,908 |
[1] | All of the investment is or will be encumbered as security for the Company’s $0.7 billion senior secured credit facility with ING Capital LLC (“ING”) initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the “February 2019 Credit Facility”).
[2] | All of the investment is or will be encumbered as security for the Company’s $0.8 billion February 2019 Credit Facility with ING.

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Name: | us-gaap_InvestmentOwnedAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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