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Distributions - Costs of Investments for Tax Purposes (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Tax cost	$ 3,209,491	$ 3,114,145	$ 2,950,729
Gross unrealized appreciation on investments	438,214	343,520	190,217
Gross unrealized depreciation on investments	(409,919)	(298,616)	(181,579)
Total investments at fair value	$ 3,237,786	$ 3,159,049	$ 2,959,367

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Tax Basis Of Investments, Fair Value For Income Tax Purposes

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- Definition

The aggregate cost of investments for Federal income tax purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-03(h)(2)(iv))
-URI https://asc.fasb.org/extlink&oid=126898976&loc=d3e600178-122990

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- Definition

Aggregate gross unrealized appreciation for all Investments in which there is an excess of value over tax cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-03(h)(2)(i))
-URI https://asc.fasb.org/extlink&oid=126898976&loc=d3e600178-122990

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The aggregate gross unrealized depreciation for all Investments in which there is an excess of tax cost over value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-03(h)(2)(ii))
-URI https://asc.fasb.org/extlink&oid=126898976&loc=d3e600178-122990

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