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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

X

- Definition

Value of input used to measure investment owned by investment company.

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X

- Definition

Fair value of investment in security owned.

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-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

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