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INVESTMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 2,571,228,000	$ 2,449,272,000
Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,819,640,000	1,686,411,000
Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	159,085,000	165,455,000
Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	53,766,000	79,548,000
Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	434,144,000	409,129,000
Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	2,802,000	2,732,000
Royalty rights
Schedule of Equity Method Investments [Line Items]
Fair Value	6,379,000	5,833,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,767,792,000	1,625,501,000
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	140,472,000	153,703,000
Fair Value, Inputs, Level 3 | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	23,504,000	48,664,000
Fair Value, Inputs, Level 3 | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	429,043,000	408,475,000
Fair Value, Inputs, Level 3 | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	2,802,000	2,732,000
Fair Value, Inputs, Level 3 | Royalty rights
Schedule of Equity Method Investments [Line Items]
Fair Value	6,379,000	5,833,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,474,172,000	1,323,618,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	89,687,000	94,912,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	2,739,000	28,904,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	31,197,000	30,302,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Royalty rights
Schedule of Equity Method Investments [Line Items]
Fair Value	6,379,000	5,833,000
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	39,634,000	50,535,000
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	49,993,000	47,775,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	355,198,000	339,142,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	2,799,000	2,729,000
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	712,000	1,353,000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	250,306,000	247,508,000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 792,000	$ 702,000
Input	0.980	0.980
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 5,250,000
Input		1.000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 14,602,000	$ 10,008,000
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 19,983,000	$ 16,852,000
Input	0.129	0.129
Fair Value, Inputs, Level 3 | Net Asset Approach | Liabilities | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 4,497,000	$ 3,875,000
Input	100,714,100	96,678,300
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 3,791,000
Input		3,790,600
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 469,000	$ 1,733,000
Input	469,400	1,733,300
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 55,000	$ 59,000
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 3,000	$ 3,000
Input	3,000.0	3,000.0
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	$ 3,680,000	$ 3,840,000
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		6,523,000
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	20,296,000	12,777,000
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	$ 2,799,000	$ 6,884,000
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.054	0.065
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	0.080
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.093	0.076
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.115	0.108
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Royalty rights
Schedule of Equity Method Investments [Line Items]
Input	0.156	0.186
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	0.5
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	0.9	0.9
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.5	0.5
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	0.5	0.5
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	5.5	5.5
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.975	0.950
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.00	1.00
Minimum | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	2,500	2,500
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.221	0.758
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.200	0.186
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	0.305	0.305
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Royalty rights
Schedule of Equity Method Investments [Line Items]
Input	0.300	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	11.0
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	27.7	22.4
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	28.5	28.5
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	11.5	11.8
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	8.5	8.8
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 | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	1,000	1,847.58
Maximum | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	52,100	56,900
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	0.106	0.105
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	0.128	0.127
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.097	0.082
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.161	0.157
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Royalty rights
Schedule of Equity Method Investments [Line Items]
Input	0.196	0.210
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	5.7	6.3
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	13.4	11.7
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	14.7	12.9
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	8.7	8.1
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	5.9	6.0
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	0.990	0.987
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	0.980
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Structured products
Schedule of Equity Method Investments [Line Items]
Input		1.000
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	144.06	1,525.9
Weighted Average | Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.129	0.129
Weighted Average | Fair Value, Inputs, Level 3 | Net Asset Approach | Liabilities | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	100,714,100	96,678,300
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input		3,790,600
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Structured products
Schedule of Equity Method Investments [Line Items]
Input	469,400	1,733,300
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	49,800	54,600
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

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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