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INVESTMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 2,395,660,000	$ 2,488,715,000
Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,581,827,000	1,670,300,000
Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	226,055,000	238,215,000
Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	92,487,000	93,038,000
Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	383,304,000	374,704,000
Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	2,624,000	2,392,000
Royalty rights
Schedule of Equity Method Investments [Line Items]
Fair Value	3,871,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,519,947,000	1,593,797,000
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	213,023,000	223,798,000
Fair Value, Inputs, Level 3 | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	45,500,000	42,972,000
Fair Value, Inputs, Level 3 | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	382,595,000	374,572,000
Fair Value, Inputs, Level 3 | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	2,624,000	2,392,000
Fair Value, Inputs, Level 3 | Royalty rights
Schedule of Equity Method Investments [Line Items]
Fair Value	3,871,000
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	1,352,872,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	152,920,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	32,298,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	29,729,000
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	44,784,000	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	53,325,000	39,826,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	322,402,000	328,210,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	2,621,000
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	1,617,000	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	$ 16,086,000	$ 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	$ 3,535,000
Input	76,365,900	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	$ 68,000
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	$ 105,185,000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 709,000
Input	0.980
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 277,000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Royalty rights
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 3,871,000
Input	1.00
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	$ 17,106,000	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	6,069,000	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	13,202,000	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	$ 8,881,000	$ 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	0.081	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	0.085	0.085
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.091	0.092
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.097
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	1.9	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	6.0	7.0
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	3.8	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	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	0.950	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	0.220	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	0.180	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	0.257
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	11.5	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	23.2	12.3
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	27.0	30.0
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	11.5	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	65,900
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
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	0.115	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	0.133	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	0.143	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	10.8	8.2
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	15.4	10.6
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	7.7	7.3
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	6.4	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	76,365,900	55,281,800
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	63,600	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	0.980	0.993
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	100.00	9.5
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Royalty rights
Schedule of Equity Method Investments [Line Items]
Input	1.00

X

- Definition

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

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Fair value of investment in security owned.

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