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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 ($)
Dec. 31, 2022
USD ($)
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.