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INVESTMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 2,416,714,000	$ 2,488,715,000
Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,632,057,000	1,670,300,000
Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	199,971,000	238,215,000
Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	91,493,000	93,038,000
Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	382,531,000	374,704,000
Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	2,600,000	2,392,000
Royalty rights
Schedule of Equity Method Investments [Line Items]
Fair Value	3,819,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,559,820,000	1,593,797,000
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	187,305,000	223,798,000
Fair Value, Inputs, Level 3 | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	45,682,000	42,972,000
Fair Value, Inputs, Level 3 | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	378,208,000	374,572,000
Fair Value, Inputs, Level 3 | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	2,600,000	2,392,000
Fair Value, Inputs, Level 3 | Royalty rights
Schedule of Equity Method Investments [Line Items]
Fair Value	3,819,000
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	1,365,234,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	127,431,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	32,903,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	29,008,000
Input		0.146
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Royalty rights
Schedule of Equity Method Investments [Line Items]
Fair Value	3,819,000
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	48,076,000	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	52,566,000	39,826,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	323,252,000	328,210,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	2,597,000
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	1,473,000	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	$ 15,677,000	$ 12,159,000
Input	0.144	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	$ 3,649,000
Input	88,826,000	55,281,800
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	$ 64,000
Input		2,500
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 3,000
Input	3,000.0	3,000.0
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	$ 134,738,000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,012,000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	2,228,000
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	11,772,000	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	6,296,000	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	12,779,000	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	$ 2,857,000	$ 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	0.066	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	0.086	0.085
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.076	0.092
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.112
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Royalty rights
Schedule of Equity Method Investments [Line Items]
Input	0.206
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	0.5	1.1
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	5.6	7.0
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.5	4.5
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	0.5	6.3
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	5.5	6.5
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.00
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.970	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	0.980
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.98	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	0.759	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	0.181	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	0.335
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Royalty rights
Schedule of Equity Method Investments [Line Items]
Input	0.264
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	10.5	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	23.9	12.3
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	28.0	30.0
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	11.6	12.5
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	9.0	9.5
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	61,500
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.995	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	1.000
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	100.00	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	0.105	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	0.123	0.135
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.083	0.097
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.157	0.146
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Royalty rights
Schedule of Equity Method Investments [Line Items]
Input	0.230
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	7.8	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	10.4	8.2
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	13.5	10.6
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	7.9	7.3
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	6.2	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	0.144	0.142
Weighted Average | Fair Value, Inputs, Level 3 | Net Asset Approach | Liabilities | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	88,826,000	55,281,800
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	59,200	2,500
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	3,000.0	3,000.0
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	0.983	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	0.986	0.993
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	11.47	9.5

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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X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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-Section 50
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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