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INVESTMENTS - Weighted Average Range of Unobservable Inputs is Based on Fair Value of Investments (Details) $ in Thousands | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | $ 2,332,492 | [1] | $ 1,800,594 | [2]
Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 1,557,396 |  | 1,221,598 |
Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 279,838 |  | 240,037 |
Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 67,811 |  | 40,271 |
Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 279,564 |  | 154,477 |
Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 44 |  | 1,107 |
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 1,462,413 |  | 1,137,323 |
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 269,995 |  | 230,569 |
Fair Value, Inputs, Level 3 | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 9,482 |  | 0 |
Fair Value, Inputs, Level 3 | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 277,488 |  | 151,282 |
Fair Value, Inputs, Level 3 | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 3 |  | 864 |
Fair Value, Inputs, Level 3 | Yield Analysis | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned |  |  | 717,374 |
Fair Value, Inputs, Level 3 | Yield Analysis | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned |  |  | 107,345 |
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 1,198,500 |  |  |
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 181,741 |  |  |
Fair Value, Inputs, Level 3 | Market Approach | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned |  |  | 64,895 |
Fair Value, Inputs, Level 3 | Market Approach | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned |  |  | 137,393 |
Fair Value, Inputs, Level 3 | Market Approach | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned |  |  | 864 |
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 of investment owned | $ 16,479 |  |  |
Input | 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 of investment owned | $ 29,772 |  |  |
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 223,502 |  |  |
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 3 |  |  |
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | $ 1,171 |  |  |
Input | 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 of investment owned | $ 4,495 |  |  |
Input | 0.7 |  |  |
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | $ 27,103 |  |  |
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 of investment owned | 23,823 |  |  |
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | $ 4,274 |  |  |
Input | 0.0927 |  |  |
Fair Value, Inputs, Level 3 | Recent Transaction | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned |  |  | 416,010 |
Fair Value, Inputs, Level 3 | Recent Transaction | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned |  |  | 40,354 |
Fair Value, Inputs, Level 3 | Recent Transaction | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned |  |  | 4,546 |
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | $ 190,721 |  |  |
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 8,807 |  |  |
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | 18,279 |  |  |
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | $ 1,814 |  |  |
Input | 1,814 |  |  |
Fair Value, Inputs, Level 3 | Expected Transaction | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned |  |  | $ 6,197 |
Fair Value, Inputs, Level 3 | Expected Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment owned | $ 5,862 |  |  |
Input | 5,495 |  | 6,197,037 |
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 of investment owned | $ 31,719 |  | $ 3,938 |
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 of investment owned | 43,366 |  | 17,974 |
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 of investment owned | 5,208 |  |  |
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 of investment owned | $ 2,742 |  | $ 3,146 |
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.069 |  | 0.052 |
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.084 |  | 0.053 |
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 | 6.25 |  | 0.6 |
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 4.3 |  | 5.5 |
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 3.3 |  | 5.0 |
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.2 |  |  |
Minimum | 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 | 0.095 |  |  |
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.968 |  | 0.965 |
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.960 |  | 0.970 |
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.00 |  | 1.0 |
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.331 |  | 0.335 |
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 |  | 0.190 |
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 | 9.75 |  | 9.0 |
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 43.0 |  | 54.0 |
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 18.5 |  | 6.0 |
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 29.8 |  |  |
Maximum | 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 | 0.129 |  |  |
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 1.000 |  | 0.990 |
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 1.000 |  | 1.000 |
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 953.45 |  | 1,000 |
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 | 0.108 |  | 0.077 |
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 | 0.125 |  | 0.115 |
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 | 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 | 7.5 |  | 5.67 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 9.4 |  | 13.1 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 3.3 |  | 6.0 |
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 |  |  |
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 | 0.7 |  |  |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 13.1 |  |  |
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 | 0.116 |  |  |
Weighted Average | Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.0927 |  |  |
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 | 0.979 |  | 0.977 |
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 | 0.980 |  | 98 |
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 747.2 |  | 140.03 |
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 1,814 |  |  |
Weighted Average | Fair Value, Inputs, Level 3 | Expected Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 5,495 |  | 6,197,037 |
[1] | Some or all of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the "February 2019 Credit Facility").
[2] | Some or all of the investment is or will be encumbered as security for the Company's senior secured credit facility with ING Capital LLC.

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