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Investments - Summary Investment Holdings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 1,760,030	$ 1,754,039	[1]
Investments, Excluding Short-Term Investments
Summary of Investment Holdings [Line Items]
Investments at Fair Value	1,749,161	1,666,122
Short term investments
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 10,869	$ 87,917	[1]
Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	100.00%	100.00%
Investments at fair value | Geographic Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	100.00%	100.00%
United States
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 1,739,866	$ 1,653,615
United States | Investments at fair value | Geographic Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	99.50%	99.30%
Canada
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 7,452	$ 8,739
Canada | Investments at fair value | Geographic Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	0.40%	0.50%
Cayman Islands
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 1,179	$ 2,998
Cayman Islands | Investments at fair value | Geographic Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	0.10%	0.20%
Bermuda
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 664	$ 770
Bermuda | Investments at fair value | Geographic Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	0.00%	0.00%
Services: Business
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 336,055	$ 240,316
Services: Business | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	19.20%	14.40%
Healthcare & Pharmaceuticals
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 237,082	$ 250,049
Healthcare & Pharmaceuticals | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	13.60%	15.00%
Media: Diversified & Production
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 134,927	$ 139,399
Media: Diversified & Production | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	7.70%	8.40%
Services: Consumer
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 115,849	$ 119,365
Services: Consumer | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	6.60%	7.20%
Media: Advertising, Printing & Publishing
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 105,375	$ 94,610
Media: Advertising, Printing & Publishing | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	6.00%	5.70%
Diversified Financials
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 99,819	$ 101,032
Diversified Financials | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	5.70%	6.10%
Retail
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 74,718	$ 56,726
Retail | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	4.30%	3.40%
Energy: Oil & Gas
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 68,756	$ 32,164
Energy: Oil & Gas | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	3.90%	1.90%
Chemicals, Plastics & Rubber
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 66,753	$ 109,860
Chemicals, Plastics & Rubber | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	3.80%	6.60%
Consumer Goods: Durable
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 60,735	$ 58,124
Consumer Goods: Durable | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	3.50%	3.50%
High Tech Industries
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 56,501	$ 65,544
High Tech Industries | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	3.20%	3.90%
Consumer Goods: Non-Durable
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 47,886	$ 45,682
Consumer Goods: Non-Durable | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	2.80%	2.70%
Hotel, Gaming & Leisure
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 46,739	$ 50,855
Hotel, Gaming & Leisure | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	2.70%	3.00%
Construction & Building
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 46,007	$ 27,585
Construction & Building | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	2.60%	1.70%
Beverage, Food & Tobacco
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 45,396	$ 49,054
Beverage, Food & Tobacco | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	2.60%	2.90%
Banking, Finance, Insurance & Real Estate
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 43,836	$ 40,634
Banking, Finance, Insurance & Real Estate | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	2.50%	2.40%
Capital Equipment
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 41,580	$ 82,795
Capital Equipment | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	2.40%	5.00%
Aerospace & Defense
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 38,842	$ 38,279
Aerospace & Defense | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	2.20%	2.30%
Containers, Packaging & Glass
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 19,551	$ 0
Containers, Packaging & Glass | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	1.10%	0.00%
Telecommunications
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 18,302	$ 24,649
Telecommunications | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	1.10%	1.50%
Automotive
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 16,255	$ 14,367
Automotive | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	0.90%	0.90%
Metals & Mining
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 15,780	$ 10,927
Metals & Mining | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	0.90%	0.70%
Transportation: Cargo
Summary of Investment Holdings [Line Items]
Investments at Fair Value	$ 12,417	$ 14,106
Transportation: Cargo | Investments at fair value | Industry Concentration
Summary of Investment Holdings [Line Items]
Percentage of Investment Portfolio	0.70%	0.80%
[1] Fair value determined in good faith by the Company’s board of directors (see Note 9) using significant unobservable inputs unless otherwise noted.

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