Investments - Summary of Industry Composition of Investments at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2022		Dec. 31, 2021
Summary Of Investment Holdings [Line Items]
Fair Value	$ 1,262,956	[1],[2],[3]	$ 1,270,366	[4],[5],[6]
Percentage of Fair Value	100.00%		100.00%
Health Care Equipment & Services
Summary Of Investment Holdings [Line Items]
Fair Value	$ 361,940		$ 380,046
Percentage of Fair Value	28.70%		29.90%
Software And Services
Summary Of Investment Holdings [Line Items]
Fair Value	$ 268,305		$ 246,352
Percentage of Fair Value	21.30%		19.40%
Commercial & Professional Services
Summary Of Investment Holdings [Line Items]
Fair Value	$ 201,213		$ 202,311
Percentage of Fair Value	15.90%		15.90%
Consumer Services
Summary Of Investment Holdings [Line Items]
Fair Value	$ 118,898		$ 94,292
Percentage of Fair Value	9.40%		7.40%
Insurance
Summary Of Investment Holdings [Line Items]
Fair Value	$ 58,032		$ 54,439
Percentage of Fair Value	4.60%		4.30%
Pharmaceuticals Biotechnology And Life Sciences
Summary Of Investment Holdings [Line Items]
Fair Value	$ 55,020		$ 53,005
Percentage of Fair Value	4.40%		4.20%
Retailing
Summary Of Investment Holdings [Line Items]
Fair Value	$ 54,832		$ 34,275
Percentage of Fair Value	4.30%		2.70%
Capital Goods
Summary Of Investment Holdings [Line Items]
Fair Value	$ 40,838		$ 37,328
Percentage of Fair Value	3.20%		2.90%
Automobiles and Components
Summary Of Investment Holdings [Line Items]
Fair Value	$ 38,004		$ 37,835
Percentage of Fair Value	3.00%		3.00%
Diversified Financials
Summary Of Investment Holdings [Line Items]
Fair Value	$ 28,975		$ 57,960
Percentage of Fair Value	2.30%		4.60%
Consumer Durables And Apparel
Summary Of Investment Holdings [Line Items]
Fair Value	$ 19,244		$ 18,522
Percentage of Fair Value	1.50%		1.50%
Food, Beverage & Tobacco
Summary Of Investment Holdings [Line Items]
Fair Value	$ 8,491		$ 9,838
Percentage of Fair Value	0.70%		0.80%
Telecommunication Services
Summary Of Investment Holdings [Line Items]
Fair Value	$ 4,061		$ 4,480
Percentage of Fair Value	0.30%		0.40%
Energy
Summary Of Investment Holdings [Line Items]
Fair Value	$ 2,185		$ 15,155
Percentage of Fair Value	0.20%		1.20%
Food & Staples Retailing
Summary Of Investment Holdings [Line Items]
Fair Value	$ 1,664		$ 4,209
Percentage of Fair Value	0.10%		0.30%
Transportation
Summary Of Investment Holdings [Line Items]
Fair Value	$ 1,254		$ 9,297
Percentage of Fair Value	0.10%		0.70%
Materials
Summary Of Investment Holdings [Line Items]
Fair Value			$ 6,912
Percentage of Fair Value			0.50%
Household And Personal Products
Summary Of Investment Holdings [Line Items]
Fair Value			$ 4,110
Percentage of Fair Value			0.30%

[1] All debt investments are income-producing, unless otherwise noted. Equity and member interests are non-income-producing unless otherwise noted. The Company generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933 (the “1933 Act” or the "Securities Act"). Its investments are therefore generally subject to certain limitations on resale, and may be deemed to be “restricted securities” under the Securities Act.

[2] All positions held are non-controlled/non-affiliated investments, unless otherwise noted, as defined by the Investment Company Act of 1940 (the “1940 Act”). Non-controlled/non-affiliated investments are investments that are neither controlled nor affiliated.

[3] The fair value of the investment was determined using significant unobservable inputs unless otherwise noted, as defined by the 1940 Act. See Note 2 “Summary of Significant Accounting Policies”

[4] All debt investments are income-producing, unless otherwise noted. Equity and member interests are non-income-producing unless otherwise noted. The Company generally acquires its investments in private transactions exempt from registration under the Securities Act. Its investments are therefore generally subject to certain limitations on resale, and may be deemed to be “restricted securities” under the Securities Act.

[5] All positions held are non-controlled/non-affiliated investments, unless otherwise noted, as defined by the Investment Company Act of 1940 (“1940 Act”). Non-controlled/non-affiliated investments are investments that are neither controlled nor affiliated.

[6] The fair value of the investment was determined using significant unobservable inputs unless otherwise noted, as defined by the 1940 Act. See Note 2 “Summary of Significant Accounting Policies”.