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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 2,505,992 | [1] | $ 2,448,935 | [2]
Senior debt and 1st lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,700,975 |  | 1,696,192 |
Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 246,997 |  | 263,139 |
Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 81,068 |  | 73,550 |
Equity shares |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 356,201 |  | 284,570 |
Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,144 |  | 1,057 |
Investments Subject to Leveling |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 2,386,385 |  | 2,318,508 |
Investment in joint ventures / PE fund |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 119,607 |  | 130,427 |
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 | 121 |  | 164 |
Level 1 | Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 1 | Investments Subject to Leveling |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 121 |  | 164 |
Level 2 | Senior debt and 1st lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 104,846 |  | 104,836 |
Level 2 | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 37,907 |  | 28,925 |
Level 2 | Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 50,173 |  | 55,723 |
Level 2 | Equity shares |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 905 |  | 1,339 |
Level 2 | Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 0 |  | 0 |
Level 2 | Investments Subject to Leveling |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 193,831 |  | 190,823 |
Level 3 | Senior debt and 1st lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,596,129 |  | 1,591,356 |
Level 3 | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 209,090 |  | 234,214 |
Level 3 | Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 30,895 |  | 17,827 |
Level 3 | Equity shares |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 355,175 |  | 283,067 |
Level 3 | Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,144 |  | 1,057 |
Level 3 | Investments Subject to Leveling |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 2,192,433 |  | $ 2,127,521 |
[1] | All of the investment is or will be encumbered as security for the Company’s $1.1 billion senior secured credit facility with ING Capital LLC 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 $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in the February 2019 Credit Facility.

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

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