Annual report pursuant to Section 13 and 15(d)

Investments - Schedule of Realized Gains and Losses and Changes in Unrealized Appreciation and Depreciation on Control and Affiliate investments (Details)

v3.22.4
Investments - Schedule of Realized Gains and Losses and Changes in Unrealized Appreciation and Depreciation on Control and Affiliate investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Investments [Line Items]      
Total investments at fair value $ 2,963,955 $ 2,434,522  
Interest income 307,258 253,360 $ 263,379
Fee income 14,430 27,616 23,879
Net Change in Unrealized Appreciation (Depreciation) (85,063) 3,311 126,226
Total net realized gain (loss) (924) 20,876 (56,105)
Investment, Affiliated Issuer, Controlled [Member]      
Schedule Of Investments [Line Items]      
Total investments at fair value 76,458 [1] 73,504 [2] 57,400
Interest income 4,621 4,009 2,857
Fee income 68 59 21
Net Change in Unrealized Appreciation (Depreciation) (278) (2,677) (2,271)
Total net realized gain (loss) 0 0  
Investment, Affiliated Issuer, Controlled [Member] | Control Investments      
Schedule Of Investments [Line Items]      
Total investments at fair value [3] 76,458 73,504 57,400
Interest income [3] 4,621 4,009 2,857
Fee income [3] 68 59 21
Net Change in Unrealized Appreciation (Depreciation) [3] (278) (2,677) (2,271)
Total net realized gain (loss) [3] 0 0 0
Investment, Affiliated Issuer, Controlled [Member] | Coronado Aesthetics, LLC      
Schedule Of Investments [Line Items]      
Total investments at fair value [3] 319 565  
Interest income [3] 0 0  
Fee income [3] 0 0  
Net Change in Unrealized Appreciation (Depreciation) [3] (246) 315  
Total net realized gain (loss) [3] 0 0  
Investment, Affiliated Issuer, Controlled [Member] | Gibraltar Business Capital, LLC      
Schedule Of Investments [Line Items]      
Total investments at fair value [3] 36,944 43,830 48,800
Interest income [3] 3,385 3,178 2,249
Fee income [3] 68 54 21
Net Change in Unrealized Appreciation (Depreciation) [3] (6,968) (14,616) (1,419)
Total net realized gain (loss) [3] 0 0 0
Investment, Affiliated Issuer, Controlled [Member] | Hercules Adviser LLC      
Schedule Of Investments [Line Items]      
Total investments at fair value [3] 31,153 20,840  
Interest income [3] 546 141  
Fee income [3] 0 0  
Net Change in Unrealized Appreciation (Depreciation) [3] 7,163 11,955  
Total net realized gain (loss) [3] 0 0  
Investment, Affiliated Issuer, Controlled [Member] | Tectura Corporation      
Schedule Of Investments [Line Items]      
Total investments at fair value [3] 8,042 8,269 8,600
Interest income [3] 690 690 608
Fee income [3] 0 5 0
Net Change in Unrealized Appreciation (Depreciation) [3] (227) (331) (852)
Total net realized gain (loss) [3] 0 0 0
Investment, Affiliated Issuer, Noncontrolled [Member]      
Schedule Of Investments [Line Items]      
Total investments at fair value 0 9,458 [2] 8,340
Interest income 1,204 10 533
Net Change in Unrealized Appreciation (Depreciation) 4,089 63,806 259
Total net realized gain (loss) 1,758 (62,143) (14,149)
Investment, Affiliated Issuer, Noncontrolled [Member] | Affiliate Investments [Member]      
Schedule Of Investments [Line Items]      
Total investments at fair value [3] 0 9,458 8,340
Interest income [3] 1,204 10 533
Fee income [3] 0 0 0
Net Change in Unrealized Appreciation (Depreciation) [3] 4,089 63,806 259
Total net realized gain (loss) [3] 1,758 (62,143) (14,149)
Investment, Affiliated Issuer, Noncontrolled [Member] | Black Crow AI, Inc. affiliates      
Schedule Of Investments [Line Items]      
Total investments at fair value [3] 0 [4] 1,120  
Interest income [3] 0 [4] 0  
Fee income [3] 0 [4] 0  
Net Change in Unrealized Appreciation (Depreciation) [3] (120) [4] 1,905  
Total net realized gain (loss) [3] 3,772 [4] 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Pineapple Energy LLC      
Schedule Of Investments [Line Items]      
Total investments at fair value [3] 0 [4] 8,338 8,340
Interest income [3] 1,204 [4] 10 0
Fee income [3] 0 [4] 0 0
Net Change in Unrealized Appreciation (Depreciation) [3] 4,209 [4] (282) (3,927)
Total net realized gain (loss) [3] (2,014) [4] 0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Solar Spectrum Holdings LLC (p.k.a. Sungevity, Inc.)      
Schedule Of Investments [Line Items]      
Total investments at fair value [3]   0 0
Interest income [3]   0 520
Fee income [3]   0 0
Net Change in Unrealized Appreciation (Depreciation) [3]   62,183 (346)
Total net realized gain (loss) [3]   (62,143) (3)
Investment, Affiliated Issuer, Noncontrolled [Member] | Optiscan BioMedical, Corp.      
Schedule Of Investments [Line Items]      
Total investments at fair value [3]     0
Interest income [3]     13
Fee income [3]     0
Net Change in Unrealized Appreciation (Depreciation) [3]     4,532
Total net realized gain (loss) [3]     (14,146)
Investment, Affiliated Issuer [Member] | Control & Affiliate Investments [Member]      
Schedule Of Investments [Line Items]      
Total investments at fair value [3] 76,458 82,962 65,740
Interest income [3] 5,825 4,019 3,390
Fee income [3] 68 59 21
Net Change in Unrealized Appreciation (Depreciation) [3] 3,811 61,129 (2,012)
Total net realized gain (loss) [3] $ 1,758 $ (62,143) $ (14,149)
[1] All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[2] All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[3] In accordance with Rules 3-09, 4-08(g), and Rule 10-01(b)(1) of Regulation S-X, (“Rule 3-09”, “Rule 4-08(g)”, and “Rule 10-01(b)(1)”, respectively), the Company must determine if its unconsolidated subsidiaries are considered “significant subsidiaries”. As of December 31, 2022, December 31, 2021, and December 31, 2020 there were no unconsolidated subsidiaries that are considered “significant subsidiaries”.
[4] As of September 30, 2022, Black Crow AI, Inc. and Pineapple Energy LLC were no longer affiliates as defined under the 1940 Act.