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Distributable Taxable Income - Reconciliation of Net Increase in Net Assets Resulting From Operations to Taxable Income (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net increase (decrease) in net assets resulting from operations |  | $ (12,416) | $ (4,205) | $ (8,433) | $ 4,058 | $ (2,000) | $ 9,144 | $ 10,844 | $ 8,037 | $ (20,996) | $ 26,026 | $ 31,573
Tax (provision) benefit on realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  |  | 786 | 1,442 |
Net change in unrealized (appreciation) depreciation from investments |  |  |  |  |  |  |  |  |  | 17,915 | 8,443 | (6,813)
Net realized losses |  |  |  |  |  |  |  |  |  | 31,185 | 6,093 | (7,759)
Book/tax differences on CLO equity investments |  |  |  |  |  |  |  |  |  | (72) | 3,410 | (3,527)
Book/tax differences related to mergers and partnership investments |  |  |  |  |  |  |  |  |  | (586) | (23,639) | (5,829)
Other book/tax differences |  |  |  |  |  |  |  |  |  | 1,203 | 939 | 3,135
Taxable income before deductions for distributions |  |  |  |  |  |  |  |  |  | $ 29,579 | $ 22,714 | $ 10,779
Taxable income before deductions for distributions per weighted average basic and diluted shares for the period | [1] |  |  |  |  |  |  |  |  | $ 3.07 | $ 2.66 | $ 2.16
[1] | The Company completed a Reverse Stock Split of 10 to 1 effective August 26, 2021, amounts have been adjusted retroactively to reflect the split.

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