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Portfolio Company Investments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) Investment	Dec. 31, 2023 USD ($) Investment	Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Number of investment portfolio companies | Investment	87	81
Number of residual investment porfolio companies | Investment	4	1
Aggregate fair value of total portfolio	$ 1,090,506,000	$ 957,906,000
Weighted average yield investment percentage	13.30%	14.20%
Average fully diluted equity ownership percentage	3.50%	3.00%
Percentage of equity investments held in portfolio companies	85.70%	79.30%
Purchases of debt and equity investments	$ 394,532,000	$ 336,741,000	$ 333,846,000
Proceeds from sales and repayments	$ 276,861,000	$ 258,875,000	$ 193,980,000
Number of investments represented more than ten percentage of aggregate investment portfolio | Investment	0	0
Investment	$ 0	$ 0
Investments as percentage of total assets	5.00%	5.00%
Investment, Type [Extensible Enumeration]	Pfanstiehl, Inc	Pfanstiehl, Inc
Maximum
Schedule of Investments [Line Items]
Investment maturity period	7 years
Minimum
Schedule of Investments [Line Items]
Investment maturity period	5 years

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