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Investments - Schedule of Portfolio Investments by Investment Type at Cost and Fair Value and as Percentage of Total Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule Of Investments [Line Items]
Cost	$ 1,147,209	$ 1,153,584
Cost, Percentage	100.00%	100.00%
Fair Value	$ 1,091,531	$ 1,094,386
Fair Value, Percentage	100.00%	100.00%
Secured Loans
Schedule Of Investments [Line Items]
Cost	$ 829,914	$ 827,377
Cost, Percentage	72.30%	71.70%
Fair Value	$ 808,002	$ 802,851
Fair Value, Percentage	74.00%	73.30%
Equipment Financing
Schedule Of Investments [Line Items]
Cost	$ 253,669	$ 266,139
Cost, Percentage	22.10%	23.10%
Fair Value	$ 239,096	$ 245,978
Fair Value, Percentage	21.90%	22.50%
Warrants
Schedule Of Investments [Line Items]
Cost	$ 21,256	$ 21,282
Cost, Percentage	1.90%	1.80%
Fair Value	$ 26,963	$ 31,724
Fair Value, Percentage	2.50%	2.90%
Equity
Schedule Of Investments [Line Items]
Cost	$ 42,370	$ 38,786
Cost, Percentage	3.70%	3.40%
Fair Value	$ 17,470	$ 13,833
Fair Value, Percentage	1.60%	1.30%

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- Definition

Investment owned at cost percentage.

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Investment owned at fair value percentage.

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- Definition

Cost of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

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- Definition

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5D
-Subparagraph (SX 210.12-13D(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
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-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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