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INVESTMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 2,623,882,000 | $ 2,449,272,000
Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,851,109,000 | 1,686,411,000
Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 192,468,000 | 165,455,000
Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 45,658,000 | 79,548,000
Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 440,536,000 | 409,129,000
Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,087,000 | 2,732,000
Royalty rights |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,542,000 | 5,833,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 1,795,252,000 | 1,625,501,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 3,694,000 | 3,840,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Market Yield | Yield Analysis |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 1,498,836,000 | $ 1,323,618,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Market Yield | Yield Analysis | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.053 | 0.065
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Market Yield | Yield Analysis | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.270 | 0.758
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Market Yield | Yield Analysis | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.105 | 0.105
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Adjusted EBITDA Multiple | Market Approach |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 64,628,000 | $ 50,535,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Adjusted EBITDA Multiple | Market Approach | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.5 | 0.5
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Adjusted EBITDA Multiple | Market Approach | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 10.5 | 11.0
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Adjusted EBITDA Multiple | Market Approach | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 5.9 | 6.3
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Transaction Price | Recent Transaction |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 228,094,000 | $ 247,508,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Transaction Price | Recent Transaction | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.960 | 0.950
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Transaction Price | Recent Transaction | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 1.000 | 1.000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Transaction Price | Recent Transaction | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.983 | 0.987
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 184,616,000 | $ 153,703,000
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 3,636,000 | 6,523,000
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Market Yield | Yield Analysis |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 88,629,000 | $ 94,912,000
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Market Yield | Yield Analysis | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.080 | 0.080
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Market Yield | Yield Analysis | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.211 | 0.186
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Market Yield | Yield Analysis | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.129 | 0.127
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Adjusted EBITDA Multiple | Market Approach |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 49,804,000 | $ 47,775,000
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Adjusted EBITDA Multiple | Market Approach | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.8 | 0.9
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Adjusted EBITDA Multiple | Market Approach | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 28.5 | 22.4
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Adjusted EBITDA Multiple | Market Approach | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 12.0 | 11.7
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Expected Recovery | Expected Recovery |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | $ 3,791,000
Input |  | 3,790,600
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Expected Recovery | Expected Recovery | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input |  | 3,790,600
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Transaction Price | Recent Transaction |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 42,547,000 | $ 702,000
Input |  | 0.980
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Transaction Price | Recent Transaction | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.960 |
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Transaction Price | Recent Transaction | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 1.000 |
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes | Transaction Price | Recent Transaction | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.965 | 0.980
Fair Value, Inputs, Level 3 | Structured products |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 19,254,000 | $ 48,664,000
Fair Value, Inputs, Level 3 | Structured products | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 16,578,000 | 12,777,000
Fair Value, Inputs, Level 3 | Structured products | Market Yield | Yield Analysis |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 2,207,000 | $ 28,904,000
Fair Value, Inputs, Level 3 | Structured products | Market Yield | Yield Analysis | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.093 | 0.076
Fair Value, Inputs, Level 3 | Structured products | Market Yield | Yield Analysis | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.103 | 0.103
Fair Value, Inputs, Level 3 | Structured products | Market Yield | Yield Analysis | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.098 | 0.082
Fair Value, Inputs, Level 3 | Structured products | Expected Recovery | Expected Recovery |  |
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 | Structured products | Expected Recovery | Expected Recovery | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 469,400 | 1,733,300
Fair Value, Inputs, Level 3 | Structured products | Transaction Price | Recent Transaction |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value |  | $ 5,250,000
Input |  | 1.000
Fair Value, Inputs, Level 3 | Structured products | Transaction Price | Recent Transaction | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input |  | 1.000
Fair Value, Inputs, Level 3 | Equity shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 439,652,000 | $ 408,475,000
Fair Value, Inputs, Level 3 | Equity shares | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | 2,799,000 | 6,884,000
Fair Value, Inputs, Level 3 | Equity shares | Market Yield | Yield Analysis |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 42,879,000 | $ 30,302,000
Fair Value, Inputs, Level 3 | Equity shares | Market Yield | Yield Analysis | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.113 | 0.108
Fair Value, Inputs, Level 3 | Equity shares | Market Yield | Yield Analysis | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.283 | 0.305
Fair Value, Inputs, Level 3 | Equity shares | Market Yield | Yield Analysis | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.168 | 0.157
Fair Value, Inputs, Level 3 | Equity shares | Adjusted EBITDA Multiple | Market Approach |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 365,080,000 | $ 339,142,000
Fair Value, Inputs, Level 3 | Equity shares | Adjusted EBITDA Multiple | Market Approach | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.5 | 0.5
Fair Value, Inputs, Level 3 | Equity shares | Adjusted EBITDA Multiple | Market Approach | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 28.5 | 28.5
Fair Value, Inputs, Level 3 | Equity shares | Adjusted EBITDA Multiple | Market Approach | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 16.8 | 12.9
Fair Value, Inputs, Level 3 | Equity shares | Revenue Multiple | Market Approach |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 776,000 | $ 1,353,000
Fair Value, Inputs, Level 3 | Equity shares | Revenue Multiple | Market Approach | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 5.5 | 5.5
Fair Value, Inputs, Level 3 | Equity shares | Revenue Multiple | Market Approach | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 9.0 | 8.8
Fair Value, Inputs, Level 3 | Equity shares | Revenue Multiple | Market Approach | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 5.9 | 6.0
Fair Value, Inputs, Level 3 | Equity shares | Discount Rate | Discounted Cash Flow Analysis |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 19,807,000 | $ 16,852,000
Input | 0.129 | 0.129
Fair Value, Inputs, Level 3 | Equity shares | Discount Rate | Discounted Cash Flow Analysis | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.129 | 0.129
Fair Value, Inputs, Level 3 | Equity shares | Liabilities | Net Asset Approach |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 4,808,000 | $ 3,875,000
Input | 115,370,300 | 96,678,300
Fair Value, Inputs, Level 3 | Equity shares | Liabilities | Net Asset Approach | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 115,370,300 | 96,678,300
Fair Value, Inputs, Level 3 | Equity shares | Expected Recovery | Expected Recovery |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 49,000 | $ 59,000
Fair Value, Inputs, Level 3 | Equity shares | Expected Recovery | Expected Recovery | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 2,500 | 2,500
Fair Value, Inputs, Level 3 | Equity shares | Expected Recovery | Expected Recovery | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 47,000.0 | 56,900
Fair Value, Inputs, Level 3 | Equity shares | Expected Recovery | Expected Recovery | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 44,800 | 54,600
Fair Value, Inputs, Level 3 | Equity shares | Transaction Price | Recent Transaction |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 3,454,000 | $ 10,008,000
Fair Value, Inputs, Level 3 | Equity shares | Transaction Price | Recent Transaction | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.00 | 1.00
Fair Value, Inputs, Level 3 | Equity shares | Transaction Price | Recent Transaction | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 135.00 | 1,847.58
Fair Value, Inputs, Level 3 | Equity shares | Transaction Price | Recent Transaction | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 5.02 | 1,525.9
Fair Value, Inputs, Level 3 | Equity warrants |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 1,087,000 | $ 2,732,000
Fair Value, Inputs, Level 3 | Equity warrants | Adjusted EBITDA Multiple | Market Approach |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 1,084,000 | $ 2,729,000
Fair Value, Inputs, Level 3 | Equity warrants | Adjusted EBITDA Multiple | Market Approach | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.5 | 0.5
Fair Value, Inputs, Level 3 | Equity warrants | Adjusted EBITDA Multiple | Market Approach | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 11.4 | 11.8
Fair Value, Inputs, Level 3 | Equity warrants | Adjusted EBITDA Multiple | Market Approach | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 11.4 | 8.1
Fair Value, Inputs, Level 3 | Equity warrants | Expected Recovery | Expected Recovery |  |
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 | Equity warrants | Expected Recovery | Expected Recovery | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 3,000.0 | 3,000.0
Fair Value, Inputs, Level 3 | Royalty rights |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 1,542,000 | $ 5,833,000
Fair Value, Inputs, Level 3 | Royalty rights | Market Yield | Yield Analysis |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair Value | $ 1,542,000 | $ 5,833,000
Fair Value, Inputs, Level 3 | Royalty rights | Market Yield | Yield Analysis | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.280 | 0.186
Fair Value, Inputs, Level 3 | Royalty rights | Market Yield | Yield Analysis | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.300 | 0.264
Fair Value, Inputs, Level 3 | Royalty rights | Market Yield | Yield Analysis | Weighted Average |  |
Schedule of Equity Method Investments [Line Items] |  |
Input | 0.290 | 0.210

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