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Investments - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost | $ 1,924,201 | [1] | $ 1,975,630 | [2]
Fair Value | $ 1,906,125 | [3] | $ 1,954,270 | [4]
Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of Investment Portfolio | 100.00% |  | 100.00% |
Senior secured first lien debt |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost | $ 1,576,712 | [1] | $ 1,604,111 | [2]
Fair Value | $ 1,536,753 | [3] | $ 1,565,171 | [4]
Senior secured first lien debt | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of Investment Portfolio | 84.30% |  | 85.00% |
Senior secured second lien debt |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost | $ 16,400 | [1] | $ 41,280 | [2]
Fair Value | $ 15,050 | [3] | $ 29,111 | [4]
Senior secured second lien debt | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of Investment Portfolio | 0.80% |  | 1.60% |
Collateralized securities and structured products - equity |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost | $ 1,024 |  | $ 2,362 |
Fair Value | $ 770 |  | $ 1,096 |
Collateralized securities and structured products - equity | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of Investment Portfolio | 0.10% |  | 0.10% |
Unsecured debt |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost | $ 24,314 | [1] | $ 31,693 | [2]
Fair Value | $ 5,493 | [3] | $ 12,874 | [4]
Unsecured debt | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of Investment Portfolio | 0.30% |  | 0.70% |
Equity |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost | $ 222,589 | [1] | $ 182,738 | [2]
Fair Value | $ 264,897 | [3] | $ 232,572 | [4]
Equity | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Percentage of Investment Portfolio | 14.50% |  | 12.60% |
Investments, Excluding Short-Term Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost | $ 1,841,039 |  | $ 1,862,184 |
Fair Value | 1,822,963 |  | 1,840,824 |
Short term investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost | 83,162 | [1] | 113,446 | [2]
Fair Value | $ 83,162 | [3] | $ 113,446 | [4]
[1] | Represents amortized cost for debt securities and cost for equity investments.
[2] | Represents amortized cost for debt securities and cost for equity investments.
[3] | Fair value determined in good faith by the Company’s board of directors (see Note 9), including via delegation to CIM as the Company’s valuation designee (see Note 2), using significant unobservable inputs unless otherwise noted.
[4] | Fair value determined in good faith by the Company’s board of directors (see Note 9), including via delegation to CIM as the Company’s valuation designee (see Note 2), using significant unobservable inputs unless otherwise noted.

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