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Portfolio Company Investments - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Investment	Dec. 31, 2021 USD ($) Investment	Dec. 31, 2020 USD ($)
Investment Holdings [Line Items]
Number of investment portfolio companies | Investment	76	70
Number of residual investment porfolio companies | Investment	2	8
Aggregate fair value of total portfolio	$ 860,329	$ 719,124
Weighted average effective yield investment percentage	13.80%	12.30%
Average fully diluted equity ownership percentage	4.00%	4.70%
Percentage of equity investments held in portfolio companies	74.40%	82.10%
Purchases of debt and equity investments	$ 333,846	$ 346,737	$ 189,996
Proceeds from sales and repayments	$ 193,980	$ 472,782	$ 210,774
Number of investments represented more than ten percentage of aggregate investment portfolio | Investment	0	0
Investments at Fair Value	$ 860,329	$ 719,124
Debt investments in portfolio companies on non-accrual status | Investment	4	1
Pfanstiehl, Inc
Investment Holdings [Line Items]
Investments at Fair Value	$ 51,992	$ 57,639
Investments as percentage of total assets	5.60%	6.40%
Maximum
Investment Holdings [Line Items]
Investment maturity period	7 years
Minimum
Investment Holdings [Line Items]
Investment maturity period	5 years

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