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INVESTMENTS - Weighted Average Range of Unobservable Inputs is Based on Fair Value of Investments (Details) $ in Thousands	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 2,556,114	$ 2,448,935
Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,765,238	1,696,192
Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	255,089	263,139
Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	79,343	73,550
Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	331,880	284,570
Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	1,056	1,057
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,650,361	1,591,356
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	225,734	234,214
Fair Value, Inputs, Level 3 | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	26,116	17,827
Fair Value, Inputs, Level 3 | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	328,984	283,067
Fair Value, Inputs, Level 3 | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	1,056	1,057
Fair Value, Inputs, Level 3 | Yield Analysis | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value		1,305,819
Fair Value, Inputs, Level 3 | Yield Analysis | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value		182,856
Fair Value, Inputs, Level 3 | Yield Analysis | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value		12,600
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,507,198
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	176,745
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	4,275
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	7,197
Fair Value, Inputs, Level 3 | Market Approach | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value		1,054
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 14,455	$ 14,794
Input	5.8	6.0
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 34,810	$ 35,536
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	269,697	259,219
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	1,053
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 1,104	$ 1,263
Input	0.2	0.2
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 924	$ 2,186
Input	0.5	0.5
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 1,431	$ 1,321
Fair Value, Inputs, Level 3 | Market Approach | Liquidation Value | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 39
Input	39,400
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA/Revenue Multiple Blend | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 221
Input		5.8
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 13,153
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 3,792
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 12,967
Input	0.126	13
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Structured products
Schedule of Equity Method Investments [Line Items]
Input		0.104
Fair Value, Inputs, Level 3 | Recent Transaction | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 233,824
Fair Value, Inputs, Level 3 | Recent Transaction | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value		513
Fair Value, Inputs, Level 3 | Recent Transaction | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value		5,239
Fair Value, Inputs, Level 3 | Recent Transaction | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 4,921
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 88,690
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 746
Input	0.970	0.973
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 9,379
Input	1.000	1.000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 46,008
Fair Value, Inputs, Level 3 | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 112
Fair Value, Inputs, Level 3 | Expected Recovery | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 3
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	112
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 3
Input	3.0	3.0
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 25,947	$ 22,503
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	12,470	13,123
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	12,462	8,796
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	2,598	2,741
Fair Value, Inputs, Level 3 | Net Asset Approach | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value		$ 1,932
Fair Value, Inputs, Level 3 | Net Asset Approach | Liabilities | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 1,941
Input	(20,598,400)	(8,941,800)
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.076	0.077
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.090	0.084
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.096
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.154	0.157
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	7.0	6.5
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	2.3	4.0
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	5.0	4.0
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.2	0.2
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.960	0.967
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.01	0.00
Minimum | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	2.5	2.5
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.433	0.373
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.169	0.166
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.106
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.167	0.178
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	11.0	9.0
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	40.0	43.0
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	16.5	17.5
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	9.5	7.0
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.986	1.000
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	1,408.64	1,015.13
Maximum | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	110.0	110
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.116	0.117
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.129	0.131
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.101
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.161	0.167
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	5.8	6.0
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	8.2	7.4
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	10.8	9.4
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	7.6	7.3
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.2	0.2
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.5	0.5
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	6.6	6.8
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Liquidation Value | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	39,400
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA/Revenue Multiple Blend | Equity shares
Schedule of Equity Method Investments [Line Items]
Input		5.8
Weighted Average | Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.126	0.130
Weighted Average | Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Structured products
Schedule of Equity Method Investments [Line Items]
Input		0.104
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.968	0.975
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Input	0.970	0.973
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Structured products
Schedule of Equity Method Investments [Line Items]
Input	1.000	1.000
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	988.3	521.22
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	107,600	107.6
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input		3.0
Weighted Average | Fair Value, Inputs, Level 3 | Net Asset Approach | Liabilities | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	(20,598,400)	(8,941,800)

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
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