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INVESTMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 2,536,315,000 [1] $ 2,449,272,000 [2]
Senior debt and 1st lien notes    
Schedule of Equity Method Investments [Line Items]    
Fair Value 1,785,626,000 1,686,411,000
Subordinated debt and 2nd lien notes    
Schedule of Equity Method Investments [Line Items]    
Fair Value 201,371,000 165,455,000
Structured products    
Schedule of Equity Method Investments [Line Items]    
Fair Value 33,602,000 79,548,000
Equity shares    
Schedule of Equity Method Investments [Line Items]    
Fair Value 425,580,000 409,129,000
Equity warrants    
Schedule of Equity Method Investments [Line Items]    
Fair Value 1,068,000 2,732,000
Royalty rights    
Schedule of Equity Method Investments [Line Items]    
Fair Value 1,581,000 5,833,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes    
Schedule of Equity Method Investments [Line Items]    
Fair Value 1,738,067,000 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   3,840,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes | Market Yield | Yield Analysis    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 1,482,773,000 $ 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 0.066 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 0.102 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 $ 73,057,000 $ 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 0.2 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 9.8 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 5.6 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 $ 182,237,000 $ 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 0.978 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 0.989 0.987
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 191,672,000 $ 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   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 $ 141,659,000 $ 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 0.070 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 0.215 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 0.130 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 $ 47,513,000 $ 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 0.7 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 25.9 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 11.9 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 $ 2,500,000 $ 702,000
Input 1.000 0.980
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 1.000 0.980
Fair Value, Inputs, Level 3 | Structured products    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 17,777,000 $ 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 15,713,000 12,777,000
Fair Value, Inputs, Level 3 | Structured products | Market Yield | Yield Analysis    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 2,064,000 $ 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   $ 1,733,000
Input   1,733,300
Fair Value, Inputs, Level 3 | Structured products | Expected Recovery | Expected Recovery | Weighted Average    
Schedule of Equity Method Investments [Line Items]    
Input   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 $ 420,943,000 $ 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 2,886,000 6,884,000
Fair Value, Inputs, Level 3 | Equity shares | Market Yield | Yield Analysis    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 44,191,000 $ 30,302,000
Fair Value, Inputs, Level 3 | Equity shares | Market Yield | Yield Analysis | Minimum    
Schedule of Equity Method Investments [Line Items]    
Input 0.117 0.108
Fair Value, Inputs, Level 3 | Equity shares | Market Yield | Yield Analysis | Maximum    
Schedule of Equity Method Investments [Line Items]    
Input 0.294 0.305
Fair Value, Inputs, Level 3 | Equity shares | Market Yield | Yield Analysis | Weighted Average    
Schedule of Equity Method Investments [Line Items]    
Input 0.169 0.157
Fair Value, Inputs, Level 3 | Equity shares | Adjusted EBITDA Multiple | Market Approach    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 341,961,000 $ 339,142,000
Fair Value, Inputs, Level 3 | Equity shares | Adjusted EBITDA Multiple | Market Approach | Minimum    
Schedule of Equity Method Investments [Line Items]    
Input 0.2 0.5
Fair Value, Inputs, Level 3 | Equity shares | Adjusted EBITDA Multiple | Market Approach | Maximum    
Schedule of Equity Method Investments [Line Items]    
Input 27.5 28.5
Fair Value, Inputs, Level 3 | Equity shares | Adjusted EBITDA Multiple | Market Approach | Weighted Average    
Schedule of Equity Method Investments [Line Items]    
Input 13.7 12.9
Fair Value, Inputs, Level 3 | Equity shares | Revenue Multiple | Market Approach    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 784,000 $ 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 8.8 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 $ 19,983,000 $ 16,852,000
Input 0.124 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 0.124 0.129
Fair Value, Inputs, Level 3 | Equity shares | Liabilities | Net Asset Approach    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 5,492,000 $ 3,875,000
Input   96,678,300
Fair Value, Inputs, Level 3 | Equity shares | Liabilities | Net Asset Approach | Minimum    
Schedule of Equity Method Investments [Line Items]    
Input 45,292,500  
Fair Value, Inputs, Level 3 | Equity shares | Liabilities | Net Asset Approach | Maximum    
Schedule of Equity Method Investments [Line Items]    
Input 117,088,000  
Fair Value, Inputs, Level 3 | Equity shares | Liabilities | Net Asset Approach | Weighted Average    
Schedule of Equity Method Investments [Line Items]    
Input 80,417,900 96,678,300
Fair Value, Inputs, Level 3 | Equity shares | Expected Recovery | Expected Recovery    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 44,000 $ 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 41,700 56,900
Fair Value, Inputs, Level 3 | Equity shares | Expected Recovery | Expected Recovery | Weighted Average    
Schedule of Equity Method Investments [Line Items]    
Input 39,500 54,600
Fair Value, Inputs, Level 3 | Equity shares | Transaction Price | Recent Transaction    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 5,602,000 $ 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 100.00 1,847.58
Fair Value, Inputs, Level 3 | Equity shares | Transaction Price | Recent Transaction | Weighted Average    
Schedule of Equity Method Investments [Line Items]    
Input 2.81 1,525.9
Fair Value, Inputs, Level 3 | Equity warrants    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 1,068,000 $ 2,732,000
Fair Value, Inputs, Level 3 | Equity warrants | Adjusted EBITDA Multiple | Market Approach    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 1,065,000 $ 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 11.3 11.8
Fair Value, Inputs, Level 3 | Equity warrants | Adjusted EBITDA Multiple | Market Approach | Weighted Average    
Schedule of Equity Method Investments [Line Items]    
Input 11.3 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 $ 1,581,000 $ 5,833,000
Fair Value, Inputs, Level 3 | Royalty rights | Market Yield | Yield Analysis    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 1,581,000 $ 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
[1] All of the investment is or will be encumbered as security for the Company’s $0.7 billion senior secured credit facility with ING Capital LLC (“ING”) initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the “February 2019 Credit Facility”).
[2] All of the investment is or will be encumbered as security for the Company’s $0.8 billion February 2019 Credit Facility with ING.