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Organization, Business, Basis of Presentation and Summary of Significant Accounting Policies - Fair Value Level 3 (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 2,448,935	$ 1,800,594
Senior debt and 1st lien notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	1,696,192	1,221,598
Subordinated debt and 2nd lien notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	263,139	240,037
Structured Products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	73,550	40,271
Equity shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	284,570	154,477
Equity warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	1,057	1,107
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	2,127,521	1,520,038
Level 3 | Senior debt and 1st lien notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	1,591,356	1,137,323
Level 3 | Senior debt and 1st lien notes | Yield Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 1,305,819	$ 717,374
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Minimum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.077	0.052
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Maximum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.373	0.335
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	0.077
Level 3 | Senior debt and 1st lien notes | Market Approach | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 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 | Weighted Average | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	6.0
Level 3 | Senior debt and 1st lien notes | Market Approach | Weighted Average | Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.2
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 | Recent Transaction
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 233,824	$ 416,010
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Minimum | Transaction Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.967	0.965
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	0.990
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Weighted Average | Transaction Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.975	0.977
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	$ 22,503	$ 3,939
Level 3 | Subordinated debt and 2nd lien notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	234,214	230,569
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 182,856	$ 107,345
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Minimum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.084	0.053
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Maximum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.166	0.190
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Weighted Average | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.131	0.115
Level 3 | Subordinated debt and 2nd lien notes | Market Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 64,895
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 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	6.5	0.6
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Maximum | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	9.0	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	7.4	5.67
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	$ 513	$ 40,354
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		0.970
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	0.973	98
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	$ 13,123	$ 17,975
Level 3 | Structured Products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	17,827	0
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 | 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	100
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 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 8,796
Level 3 | Equity shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	283,067	151,282
Level 3 | Equity shares | Yield Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 12,600
Level 3 | Equity shares | Yield Analysis | Minimum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	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	0.167
Level 3 | Equity shares | Market Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 137,393
Level 3 | Equity shares | Market Approach | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 259,219
Level 3 | Equity shares | Market Approach | Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	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	4.0	5.5
Level 3 | Equity shares | Market Approach | Minimum | Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.2
Level 3 | Equity shares | Market Approach | Maximum | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	43.0	54.0
Level 3 | Equity shares | Market Approach | Maximum | Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	7.0
Level 3 | Equity shares | Market Approach | Weighted Average | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	9.4	13.1
Level 3 | Equity shares | Market Approach | Weighted Average | Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	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	$ 4,921	$ 4,546
Level 3 | Equity shares | Recent Transaction | Minimum | Transaction Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	0.00	1.0
Level 3 | Equity shares | Recent Transaction | Maximum | Transaction Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	1,015.13	1,000
Level 3 | Equity shares | Recent Transaction | Weighted Average | Transaction Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	521.22	140.03
Level 3 | Equity shares | Net Asset Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 1,932
Level 3 | Equity shares | Net Asset Approach | Liabilities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	(8,942)
Level 3 | Equity shares | Net Asset Approach | Weighted Average | Liabilities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	(8,942)
Level 3 | Equity shares | Expected Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 112
Level 3 | Equity shares | Expected Recovery | Minimum | Expected Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	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	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	$ 2,741	$ 3,146
Level 3 | Equity shares | Expected Transaction
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 6,197
Level 3 | Equity shares | Expected Transaction | Transaction Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input		6,197,037
Level 3 | Equity shares | Expected Transaction | Weighted Average | Transaction Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input		6,197,037
Level 3 | Equity warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	1,057	$ 864
Level 3 | Equity warrants | Market Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 1,054	$ 864
Level 3 | Equity warrants | Market Approach | Minimum | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	4.0	5.0
Level 3 | Equity warrants | Market Approach | Maximum | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	17.5	6.0
Level 3 | Equity warrants | Market Approach | Weighted Average | Adjusted EBITDA Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	7.3	6.0
Level 3 | Equity warrants | Expected Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 3
Level 3 | Equity warrants | Expected Recovery | Expected Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	3.0
Level 3 | Equity warrants | Expected Recovery | Weighted Average | Expected Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input	3.0

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5D
-Subparagraph (SX 210.12-13D(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

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