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Organization, Business, Basis of Presentation and Summary of Significant Accounting Policies - Fair Value Level 3 (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 2,488,715 | [1] | $ 2,448,935
Senior debt and 1st lien notes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 1,670,300 |  | 1,696,192
Subordinated debt and 2nd lien notes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 238,215 |  | 263,139
Structured Products |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 93,038 |  | 73,550
Equity shares |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 374,704 |  | 284,570
Equity warrants |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 2,392 |  | 1,057
Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 2,237,531 |  | 2,127,521
Level 3 | Senior debt and 1st lien notes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 1,593,797 |  | 1,591,356
Level 3 | Senior debt and 1st lien notes | Yield Analysis |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 1,399,907 |  | $ 1,305,819
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Minimum | Market Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.078 |  | 0.077
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Maximum | Market Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.196 |  | 0.373
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Weighted Average | Market Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.117 |  | 0.117
Level 3 | Senior debt and 1st lien notes | Market Approach | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 32,150 |  | $ 14,794
Input |  |  | 6.0
Level 3 | Senior debt and 1st lien notes | Market Approach | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  |  | $ 1,263
Input |  |  | 0.2
Level 3 | Senior debt and 1st lien notes | Market Approach | Minimum | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 1.1 |  |
Level 3 | Senior debt and 1st lien notes | Market Approach | Maximum | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 12.5 |  |
Level 3 | Senior debt and 1st lien notes | Market Approach | Weighted Average | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 3.7 |  | 6
Level 3 | Senior debt and 1st lien notes | Market Approach | Weighted Average | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 0.002
Level 3 | Senior debt and 1st lien notes | Recent Transaction |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 136,594 |  | $ 233,824
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Minimum | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.950 |  | 0.967
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Maximum | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 1.000 |  | 1.000
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Weighted Average | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.979 |  | 0.975
Level 3 | Senior debt and 1st lien notes | Discounted Cash Flow Analysis |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  |  | $ 13,153
Level 3 | Senior debt and 1st lien notes | Discounted Cash Flow Analysis | Discount Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 0.130
Level 3 | Senior debt and 1st lien notes | Discounted Cash Flow Analysis | Weighted Average | Discount Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 0.130
Level 3 | Senior debt and 1st lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 25,146 |  | $ 22,503
Level 3 | Subordinated debt and 2nd lien notes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 223,798 |  | 234,214
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 167,250 |  | $ 182,856
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Minimum | Market Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.085 |  | 0.084
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Maximum | Market Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.189 |  | 0.166
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Weighted Average | Market Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.135 |  | 0.131
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 39,826 |  | $ 35,536
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  |  | $ 2,186
Input |  |  | 0.5
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Minimum | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 7.0 |  | 6.5
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Maximum | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 12.3 |  | 9.0
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Weighted Average | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 8.2 |  | 7.4
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Weighted Average | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 0.5
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 5,875 |  | $ 513
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 0.973
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Minimum | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.980 |  |
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Maximum | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 1.000 |  |
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Weighted Average | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.993 |  | 0.973
Level 3 | Subordinated debt and 2nd lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 10,847 |  | $ 13,123
Level 3 | Structured Products |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 42,972 |  | 17,827
Level 3 | Structured Products | Yield Analysis |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 30,529 |  |
Level 3 | Structured Products | Yield Analysis | Minimum | Discount Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.092 |  |
Level 3 | Structured Products | Yield Analysis | Maximum | Discount Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.103 |  |
Level 3 | Structured Products | Yield Analysis | Weighted Average | Discount Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.097 |  |
Level 3 | Structured Products | Recent Transaction |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  |  | $ 5,239
Level 3 | Structured Products | Recent Transaction | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 1.000
Level 3 | Structured Products | Recent Transaction | Weighted Average | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 1.000
Level 3 | Structured Products | Discounted Cash Flow Analysis |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  |  | $ 3,792
Level 3 | Structured Products | Discounted Cash Flow Analysis | Discount Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 0.104
Level 3 | Structured Products | Discounted Cash Flow Analysis | Weighted Average | Discount Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 0.104
Level 3 | Structured Products | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 12,443 |  | $ 8,796
Level 3 | Equity shares |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 374,572 |  | 283,067
Level 3 | Equity shares | Yield Analysis |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 8,788 |  | $ 12,600
Level 3 | Equity shares | Yield Analysis | Minimum | Market Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.146 |  | 0.157
Level 3 | Equity shares | Yield Analysis | Maximum | Market Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 0.178
Level 3 | Equity shares | Yield Analysis | Weighted Average | Market Yield |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.146 |  | 0.167
Level 3 | Equity shares | Market Approach | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 328,210 |  | $ 259,219
Level 3 | Equity shares | Market Approach | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 1,771 |  | 1,321
Level 3 | Equity shares | Market Approach | Adjusted EBITDA/Revenue Multiple Blend |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  |  | $ 221
Input |  |  | 5.8
Level 3 | Equity shares | Market Approach | Minimum | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 4.5 |  | 4.0
Level 3 | Equity shares | Market Approach | Minimum | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 6.5 |  | 0.2
Level 3 | Equity shares | Market Approach | Maximum | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 30.0 |  | 43.0
Level 3 | Equity shares | Market Approach | Maximum | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 9.5 |  | 7.0
Level 3 | Equity shares | Market Approach | Weighted Average | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 10.6 |  | 9.4
Level 3 | Equity shares | Market Approach | Weighted Average | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 6.9 |  | 6.8
Level 3 | Equity shares | Market Approach | Weighted Average | Adjusted EBITDA/Revenue Multiple Blend |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 5.8
Level 3 | Equity shares | Recent Transaction |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 12,947 |  | $ 4,921
Level 3 | Equity shares | Recent Transaction | Minimum | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 1.00 |  | 0.00
Level 3 | Equity shares | Recent Transaction | Maximum | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 10.00 |  | 1,015.13
Level 3 | Equity shares | Recent Transaction | Weighted Average | Transaction Price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 9.5 |  | 521.22
Level 3 | Equity shares | Discounted Cash Flow Analysis | Discount Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 12,159 |  |
Input | 0.142 |  |
Level 3 | Equity shares | Discounted Cash Flow Analysis | Weighted Average | Discount Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 0.142 |  |
Level 3 | Equity shares | Net Asset Approach |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 3,196 |  | $ 1,932
Level 3 | Equity shares | Net Asset Approach | Liabilities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 55,281.8 |  | 8,941,800
Level 3 | Equity shares | Net Asset Approach | Weighted Average | Liabilities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 55,281.8 |  | 8,941,800
Level 3 | Equity shares | Expected Recovery |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 3 |  | $ 112
Level 3 | Equity shares | Expected Recovery | Minimum | Expected Recovery |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 2.5 |  | 2.5
Level 3 | Equity shares | Expected Recovery | Maximum | Expected Recovery |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input |  |  | 110
Level 3 | Equity shares | Expected Recovery | Weighted Average | Expected Recovery |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 2.5 |  | 107.6
Level 3 | Equity shares | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 7,498 |  | $ 2,741
Level 3 | Equity warrants |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | 2,392 |  | 1,057
Level 3 | Equity warrants | Market Approach |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 2,389 |  |
Level 3 | Equity warrants | Market Approach | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  |  | $ 1,054
Level 3 | Equity warrants | Market Approach | Minimum | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 6.3 |  | 4.0
Level 3 | Equity warrants | Market Approach | Maximum | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 12.5 |  | 17.5
Level 3 | Equity warrants | Market Approach | Weighted Average | Adjusted EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 7.3 |  | 7.3
Level 3 | Equity warrants | Expected Recovery |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value | $ 3 |  | $ 3
Level 3 | Equity warrants | Expected Recovery | Expected Recovery |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 3.0 |  | 3,000.0
Level 3 | Equity warrants | Expected Recovery | Weighted Average | Expected Recovery |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Input | 3.0 |  | 3,000.0
[1] | Fair value as a percentage of net assets.

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