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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
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: | $ 3,248,046 | $ 2,963,955 |
Total fee income | 26,243 | 14,430 | $ 27,616
Total net change in unrealized appreciation (depreciation) | 25,010 | (85,063) | 3,311
Control investments |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: | 115,004 | 76,458 | 73,504
Interest income | 4,642 | 4,621 | 4,009
Total fee income | 95 | 68 | 59
Total net change in unrealized appreciation (depreciation) | 22,634 | (278) | (2,677)
Total net realized gain (loss) | 0 | 0 | 0
Control investments | Coronado Aesthetics, LLC |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: | 262 | 319 | 565
Interest income | 0 | 0 | 0
Total fee income | 0 | 0 | 0
Total net change in unrealized appreciation (depreciation) | (57) | (246) | 315
Total net realized gain (loss) | 0 | 0 | 0
Control investments | Gibraltar Acquisition LLC |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: | 62,512 |  |
Interest income | 3,344 |  |
Total fee income | 95 |  |
Total net change in unrealized appreciation (depreciation) | 9,656 |  |
Total net realized gain (loss) | 0 |  |
Control investments | Gibraltar Business Capital, LLC |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: |  | 36,944 | 43,830
Interest income |  | 3,385 | 3,178
Total fee income |  | 68 | 54
Total net change in unrealized appreciation (depreciation) |  | (6,968) | (14,616)
Total net realized gain (loss) |  | 0 | 0
Control investments | Hercules Adviser LLC |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: | 40,713 | 31,153 | 20,840
Interest income | 608 | 546 | 141
Total fee income | 0 | 0 | 0
Total net change in unrealized appreciation (depreciation) | 9,560 | 7,163 | 11,955
Total net realized gain (loss) | 0 | 0 | 0
Control investments | Tectura Corporation |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: | 11,517 | 8,042 | 8,269
Interest income | 690 | 690 | 690
Total fee income | 0 | 0 | 5
Total net change in unrealized appreciation (depreciation) | 3,475 | (227) | (331)
Total net realized gain (loss) | 0 | 0 | 0
Affiliate investments |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: |  | 0 | 9,458
Total net change in unrealized appreciation (depreciation) | 0 | 4,089 | 63,806
Total net realized gain (loss) | $ 0 | 1,758 | (62,143)
Investment, Affiliated Issuer |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: |  | 0 | 9,458
Interest income |  | 1,204 | 10
Total fee income |  | 0 | 0
Total net change in unrealized appreciation (depreciation) |  | 4,089 | 63,806
Total net realized gain (loss) |  | 1,758 | (62,143)
Investment, Affiliated Issuer | Black Crow AI, Inc. |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: |  | 0 | 1,120
Interest income |  | 0 | 0
Total fee income |  | 0 | 0
Total net change in unrealized appreciation (depreciation) |  | (120) | 1,905
Total net realized gain (loss) |  | 3,772 | 0
Investment, Affiliated Issuer | Pineapple Energy LLC |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: |  | 0 | 8,338
Interest income |  | 1,204 | 10
Total fee income |  | 0 | 0
Total net change in unrealized appreciation (depreciation) |  | 4,209 | (282)
Total net realized gain (loss) |  | (2,014) | 0
Investment, Affiliated Issuer | Solar Spectrum Holdings LLC (p.k.a. Sungevity, Inc.) |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: |  |  | 0
Interest income |  |  | 0
Total fee income |  |  | 0
Total net change in unrealized appreciation (depreciation) |  |  | 62,183
Total net realized gain (loss) |  |  | (62,143)
Control And Affiliate Issuer Investments Member |  |  |
Schedule Of Investments [Line Items] |  |  |
Investments, at fair value: |  | 76,458 | 82,962
Interest income |  | 5,825 | 4,019
Total fee income |  | 68 | 59
Total net change in unrealized appreciation (depreciation) |  | 3,811 | 61,129
Total net realized gain (loss) |  | $ 1,758 | $ (62,143)

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