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INVESTMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 2,527,537,000 | $ 2,488,715,000
Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,658,742,000 | 1,670,300,000
Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 246,902,000 | 238,215,000
Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 95,131,000 | 93,038,000
Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 413,482,000 | 374,704,000
Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 2,586,000 | 2,392,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,595,417,000 | 1,593,797,000
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 232,208,000 | 223,798,000
Fair Value, Inputs, Level 3 | Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 45,209,000 | 42,972,000
Fair Value, Inputs, Level 3 | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 391,116,000 | 374,572,000
Fair Value, Inputs, Level 3 | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 2,509,000 | 2,392,000
Fair Value, Inputs, Level 3 | Yield Analysis | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | 1,399,907,000
Fair Value, Inputs, Level 3 | Yield Analysis | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | 167,250,000
Fair Value, Inputs, Level 3 | Yield Analysis | Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | 30,529,000
Fair Value, Inputs, Level 3 | Yield Analysis | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | $ 8,788,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,340,742,000 |
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 171,135,000 |
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 32,112,000 |
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 23,191,000 |
Input |  | 0.146
Fair Value, Inputs, Level 3 | Market Approach | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | $ 2,389,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 42,618,000 | 32,150,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 48,627,000 | 39,826,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 342,771,000 | 328,210,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 2,506,000 |
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,762,000 | 1,771,000
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 16,055,000 | $ 12,159,000
Input | 0.145 | 0.142
Fair Value, Inputs, Level 3 | Net Asset Approach | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | $ 3,196,000
Fair Value, Inputs, Level 3 | Net Asset Approach | Liabilities | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 3,535,000 |
Input | 64,894,600 | 55,281,800
Fair Value, Inputs, Level 3 | Recent Transaction | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | $ 136,594,000
Fair Value, Inputs, Level 3 | Recent Transaction | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | 5,875,000
Fair Value, Inputs, Level 3 | Recent Transaction | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | 12,947,000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 190,551,000 |
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,875,000 |
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,130,000 |
Fair Value, Inputs, Level 3 | Expected Recovery | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | 3,000
Fair Value, Inputs, Level 3 | Expected Recovery | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | $ 3,000
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 3,000 |
Input | 2.5 | 2.5
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 3,000 |
Input | 3.0 | 3.0
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 21,506,000 | $ 25,146,000
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 10,571,000 | 10,847,000
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 13,097,000 | 12,443,000
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 2,669,000 | $ 7,498,000
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.061 | 0.078
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.090 | 0.085
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.090 | 0.092
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.105 |
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.9 | 1.10
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 5.0 | 7.0
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 4.5 | 4.5
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 6.3 | 6.3
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 6.0 | 6.5
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.956 | 0.950
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input |  | 0.980
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.00 | 1.00
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.270 | 0.196
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.177 | 0.189
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.103 | 0.103
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.142 |
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 12.5 | 12.5
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 11.0 | 12.3
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 27.5 | 30.0
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 12.5 | 12.5
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 9.3 | 9.5
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 1.000 | 1.000
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input |  | 1.000
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 1,037.5 | 10.00
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.113 | 0.117
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.132 | 0.135
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.096 | 0.097
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.125 | 0.146
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 7.4 | 3.7
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 7.0 | 8.2
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 10.2 | 10.6
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 7.5 | 7.3
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 6.7 | 6.9
Weighted Average | Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.145 | 0.142
Weighted Average | Fair Value, Inputs, Level 3 | Net Asset Approach | Liabilities | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 64,894,600 | 55,281,800
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.980 | 0.979
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 1.000 | 0.993
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 440.33 | 9.5
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 2,500 | 2.5
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 3.0 | 3.0

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