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Fair Value of Financial Instruments - Schedule of Portfolio Investments by Level in the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | $ 1,771,879 | $ 1,724,243
Senior secured first lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 1,616,352 | 1,526,989
Senior secured second lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 38,716 | 38,583
Collateralized securities and structured products - equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 1,366 | 2,998
Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 28,319 | 26,616
Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 77,322 | 41,140
Short term investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 9,804 | 87,917
Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 12,137 | 91,321
Level 1 | Senior secured first lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 1 | Senior secured second lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 1 | Collateralized securities and structured products - equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 1 | Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 1 | Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 2,333 | 3,404
Level 1 | Short term investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 9,804 | 87,917
Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 2 | Senior secured first lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 2 | Senior secured second lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 2 | Collateralized securities and structured products - equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 2 | Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 2 | Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 2 | Short term investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 1,759,742 | 1,632,922
Level 3 | Senior secured first lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 1,616,352 | 1,526,989
Level 3 | Senior secured second lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 38,716 | 38,583
Level 3 | Collateralized securities and structured products - equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 1,366 | 2,998
Level 3 | Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 28,319 | 26,616
Level 3 | Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | 74,989 | 37,736
Level 3 | Short term investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value disclosure | $ 0 | $ 0

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