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Investments - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 1,807,048 | [1] | $ 1,754,039 | [2]
Investments, Excluding Short-Term Investments |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | 1,797,244 |  | 1,666,122 |
Short term investments |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 9,804 | [1] | $ 87,917 | [2]
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 | $ 1,787,828 |  | $ 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 | $ 7,414 |  | $ 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 | $ 1,366 |  | $ 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 | $ 636 |  | $ 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 | $ 354,725 |  | $ 240,316 |
Services: Business | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 19.70% |  | 14.40% |
Healthcare & Pharmaceuticals |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 279,102 |  | $ 250,049 |
Healthcare & Pharmaceuticals | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 15.50% |  | 15.00% |
Media: Diversified & Production |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 159,236 |  | $ 139,399 |
Media: Diversified & Production | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 8.90% |  | 8.40% |
Services: Consumer |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 117,340 |  | $ 119,365 |
Services: Consumer | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 6.50% |  | 7.20% |
Diversified Financials |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 106,426 |  | $ 101,032 |
Diversified Financials | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 5.90% |  | 6.10% |
High Tech Industries |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 81,364 |  | $ 65,544 |
High Tech Industries | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 4.50% |  | 3.90% |
Media: Advertising, Printing & Publishing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 78,855 |  | $ 94,610 |
Media: Advertising, Printing & Publishing | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 4.40% |  | 5.70% |
Retail |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 64,919 |  | $ 56,726 |
Retail | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 3.60% |  | 3.40% |
Chemicals, Plastics & Rubber |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 66,927 |  | $ 109,860 |
Chemicals, Plastics & Rubber | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 3.70% |  | 6.60% |
Energy: Oil & Gas |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 62,688 |  | $ 32,164 |
Energy: Oil & Gas | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 3.50% |  | 1.90% |
Consumer Goods: Durable |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 61,165 |  | $ 58,124 |
Consumer Goods: Durable | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 3.40% |  | 3.50% |
Hotel, Gaming & Leisure |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 53,065 |  | $ 50,855 |
Hotel, Gaming & Leisure | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 3.00% |  | 3.00% |
Beverage, Food & Tobacco |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 49,641 |  | $ 49,054 |
Beverage, Food & Tobacco | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 2.80% |  | 2.90% |
Construction & Building |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 42,060 |  | $ 27,585 |
Construction & Building | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 2.30% |  | 1.70% |
Capital Equipment |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 41,183 |  | $ 82,795 |
Capital Equipment | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 2.30% |  | 5.00% |
Banking, Finance, Insurance & Real Estate |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 39,631 |  | $ 40,634 |
Banking, Finance, Insurance & Real Estate | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 2.20% |  | 2.40% |
Aerospace & Defense |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 38,683 |  | $ 38,279 |
Aerospace & Defense | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 2.20% |  | 2.30% |
Consumer Goods: Non-Durable |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 35,647 |  | $ 45,682 |
Consumer Goods: Non-Durable | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 2.00% |  | 2.70% |
Telecommunications |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 18,842 |  | $ 24,649 |
Telecommunications | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 1.00% |  | 1.50% |
Automotive |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 17,259 |  | $ 14,367 |
Automotive | Investments at fair value | Industry Concentration |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Percentage of Investment Portfolio | 1.00% |  | 0.90% |
Metals & Mining |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 16,202 |  | $ 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 | $ 12,284 |  | $ 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), including via delegation to CIM as the Company’s valuation designee (see Note 2), using significant unobservable inputs unless otherwise noted.
[2] | 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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