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Income Taxes - Cost and unrealized gain (loss) calculated on a tax basis (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Income Taxes |  |  |
Gross unrealized appreciation | $ 6,529 | $ 18,635 | $ 5,121
Gross unrealized depreciation | (72,587) | (4,696) | (577)
Net unrealized appreciation (depreciation) | (66,058) | 13,939 | 4,544
Tax cost of investments at year end | $ 2,939,635 | $ 2,373,435 | $ 632,437

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- Definition Amount of cost of investment for federal income tax purpose. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(h)(2)(iv)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 + Details
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