Investments at Fair Value (Tables)

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Summary of Investments at Fair Value

Investments at fair value consisted of the following at December 31, 2023 and 2022:

	December 31, 2023
	Amortized Cost (1)		Fair Value		Net Unrealized Gain (Loss)
First-lien debt investments	$	2,956,079	$	2,996,177	$	40,098
Second-lien debt investments		51,423		35,975		(15,448	)
Mezzanine debt investments		38,022		39,471		1,449
Equity and other investments		152,623		155,600		2,977
Structured credit investments		52,865		55,842		2,977
Total Investments	$	3,251,012	$	3,283,065	$	32,053

	December 31, 2022
	Amortized Cost (1)		Fair Value		Net Unrealized Gain (Loss)
First-lien debt investments	$	2,529,317	$	2,517,894	$	(11,423	)
Second-lien debt investments		42,743		40,762		(1,981	)
Mezzanine debt investments		7,497		10,158		2,661
Equity and other investments		142,103		167,685		25,582
Structured credit investments		53,066		51,426		(1,640	)
Total Investments	$	2,774,726	$	2,787,925	$	13,199

(1)The amortized cost represents the original cost adjusted for the amortization of discounts or premiums, as applicable, on debt investments using the effective interest method.

Summary of Industry Composition of Investments at Fair Value

The industry composition of investments at fair value at December 31, 2023 and 2022 is as follows:

	December 31, 2023			December 31, 2022
Automotive		1.3	%		1.2	%
Business Services		18.0	%		14.4	%
Chemicals		0.8	%		0.7	%
Communications		3.3	%		2.7	%
Education		5.3	%		5.8	%
Financial Services		11.1	%		12.8	%
Healthcare		8.9	%		9.9	%
Hotel, Gaming and Leisure		3.7	%		4.5	%
Human Resource Support Services		11.2	%		11.9	%
Insurance		0.1	%	—
Internet Services		15.1	%		13.9	%
Manufacturing		2.5	%		1.3	%
Marketing Services		0.3	%		0.4	%
Office Products		0.5	%		0.7	%
Oil, Gas and Consumable Fuels		4.7	%		3.9	%
Other		2.9	%		3.3	%
Pharmaceuticals(1)	—				0.0	%
Retail and Consumer Products		8.2	%		11.4	%
Transportation		2.1	%		1.2	%
Total		100.0	%		100.0	%

(1)Value sums to less than 0.1%

Summary of Geographic Composition of Investments at Fair Value

The geographic composition of investments at fair value at December 31, 2023 and 2022 is as follows:

	December 31, 2023			December 31, 2022
United States
Midwest		10.7	%		11.6	%
Northeast		25.4	%		25.4	%
South		20.7	%		24.3	%
West		32.0	%		30.7	%
Australia		1.8	%		2.2	%
Canada		4.5	%		4.3	%
Finland (1)		0.0	%		—
Germany		0.3	%		0.1	%
Luxembourg		0.1	%		0.1	%
Netherlands		0.1	%		—
Norway		1.5	%		0.7	%
United Kingdom		2.9	%		0.6	%
Total		100.0	%		100.0	%

(1)Value sums to less than 0.1%