Annual report pursuant to Section 13 and 15(d)

Consolidated Schedule of Investments In and Advances to Affiliates - Footnotes (Details)

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Consolidated Schedule of Investments In and Advances to Affiliates - Footnotes (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]      
Investments at fair value $ 4,286,271 [1] $ 4,102,177 [2]  
Control investments      
Schedule of Investments [Line Items]      
Investments at fair value 2,006,698 [1],[3] 1,703,172 [2],[4] $ 1,489,257
Control investments | Midwest      
Schedule of Investments [Line Items]      
Investments at fair value $ 513,943 $ 430,570  
Net assets, percentage (as a percent) 20.70% 20.40%  
Control investments | Northeast Region and Canada      
Schedule of Investments [Line Items]      
Investments at fair value $ 268,905    
Net assets, percentage (as a percent) 10.90%    
Control investments | Northeast      
Schedule of Investments [Line Items]      
Investments at fair value   $ 147,981  
Net assets, percentage (as a percent)   7.00%  
Control investments | Southeast      
Schedule of Investments [Line Items]      
Investments at fair value $ 52,278 $ 47,368  
Net assets, percentage (as a percent) 2.10% 2.20%  
Control investments | Southwest      
Schedule of Investments [Line Items]      
Investments at fair value $ 767,606 $ 609,466  
Net assets, percentage (as a percent) 31.00% 28.90%  
Control investments | West      
Schedule of Investments [Line Items]      
Investments at fair value $ 403,966 $ 467,787  
Net assets, percentage (as a percent) 16.30% 22.20%  
Affiliate investments      
Schedule of Investments [Line Items]      
Investments at fair value $ 615,002 [1],[5] $ 618,359 [2],[6] $ 549,214
Affiliate investments | Midwest      
Schedule of Investments [Line Items]      
Investments at fair value $ 76,330 $ 65,747  
Net assets, percentage (as a percent) 3.10% 3.10%  
Affiliate investments | Northeast Region and Canada      
Schedule of Investments [Line Items]      
Investments at fair value $ 114,389    
Net assets, percentage (as a percent) 4.60%    
Affiliate investments | Northeast      
Schedule of Investments [Line Items]      
Investments at fair value   $ 119,989  
Net assets, percentage (as a percent)   5.70%  
Affiliate investments | Southeast      
Schedule of Investments [Line Items]      
Investments at fair value $ 176,466 $ 206,261  
Net assets, percentage (as a percent) 7.10% 9.80%  
Affiliate investments | Southwest      
Schedule of Investments [Line Items]      
Investments at fair value $ 110,303 $ 98,814  
Net assets, percentage (as a percent) 4.50% 4.70%  
Affiliate investments | West      
Schedule of Investments [Line Items]      
Investments at fair value $ 137,514 $ 127,548  
Net assets, percentage (as a percent) 5.60% 6.00%  
[1] Investment fair value was determined using significant unobservable inputs, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[2] Investment fair value was determined using significant unobservable inputs, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[3] Control investments are defined by the 1940 Act as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
[4] Control investments are defined by the 1940 Act as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
[5] Affiliate investments are defined by the 1940 Act as investments in which between 5% and 25% (inclusive) of the voting securities are owned and the investments are not classified as Control investments.
[6] Affiliate investments are defined by the 1940 Act as investments in which between 5% and 25% (inclusive) of the voting securities are owned and the investments are not classified as Control investments.