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INVESTMENTS - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Mar. 31, 2022 | [1]
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Investments, Debt and Equity Securities [Abstract] |  |
For the remaining three months ending March 31, 2023 | $ 27,500 |
2024 | 55,468 |
2025 | 89,614 |
2026 | 202,419 |
2027 | 144,096 |
Thereafter | 38,250 |
Total contractual repayments | 557,347 |
Investments in equity securities | 165,033 |
Total cost basis of investments held as of December 31, 2022: | $ 722,380 | $ 669,248
[1] | Cumulative gross unrealized appreciation for federal income tax purposes is $140.8 million; cumulative gross unrealized depreciation for federal income tax purposes is $97.1 million. Cumulative net unrealized appreciation is $43.8 million, based on a tax cost of $670.6 million.

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