Federal Income Tax - Cost of Investments and Associated Gross Unrealized Appreciation (Depreciation) (Details) - USD ($) $ in Thousands	Dec. 31, 2025		Dec. 31, 2024
Income Tax Disclosure [Abstract]
Tax-basis amortized cost of investments	$ 318,932		$ 358,210
Tax-basis gross unrealized appreciation on investments	88,060		103,808
Tax-basis gross unrealized depreciation on investments	(64,977)		(52,353)
Tax-basis net unrealized appreciation on investments	23,083		51,455
Fair value of investments	$ 342,015	[1],[2]	$ 409,665	[3],[4]

[1] Equity ownership may be held in shares or units of companies affiliated with the portfolio company. The Company’s investments are generally classified as “restricted securities” as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144.

[2] Unless otherwise noted with footnote 14, fair value was determined using significant unobservable inputs for all of the Company’s investments and are considered Level 3 under GAAP. See Note 5 for further details.

[3] Equity ownership may be held in shares or units of companies affiliated with the portfolio company. The Company’s investments are generally classified as “restricted securities” as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144.

[4] Unless otherwise noted with footnote 14, fair value was determined using significant unobservable inputs for all of the Company’s investments and are considered Level 3 under GAAP. See Note 5 for further details.