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Financial Highlights (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Per share data |  |  |  |  |  |  |  |
Net asset value at beginning of period (in dollars per share) |  |  | $ 11.43 | $ 10.53 |  |  |  |
Total from investment operations (in dollars per share) |  |  | 0.83 | 1.37 |  |  |  |
Net increase (decrease) in net assets from capital share transactions (in dollars per share) |  |  | 0.10 | (0.01) |  |  |  |
Distributions of net investment income (in dollars per share) |  |  | (0.97) | (0.96) |  |  |  |
Stock-based compensation expense included in net investment income and other movements (in dollars per share) |  |  | 0.04 | 0.03 |  |  |  |
Net asset value at ending of period (in dollars per share) | $ 11.43 | $ 10.96 | 11.43 | 10.96 |  |  |  |
Ratios and supplemental data: |  |  |  |  |  |  |  |
Per share market value at end of period (in dollars per share) | $ 20.45 | $ 14.80 | $ 20.45 | $ 14.80 |  |  |  |
Total return |  |  | 28.84% | 19.55% |  |  |  |
Shares outstanding at end of period (in shares) | 162,428 | 144,641 | 162,428 | 144,641 |  |  |  |
Weighted average shares outstanding (in shares) | 160,748 | 141,390 | 159,096 | 138,338 |  |  |  |
Net assets at end of period | $ 1,856,545 | $ 1,585,510 | $ 1,856,545 | $ 1,585,510 | $ 1,885,938 | $ 1,802,706 | $ 1,499,006 | $ 1,401,459
Ratio of total expense to average net assets |  |  | 9.21% | 10.75% |  |  |  |
Ratio of net investment income before investment gains and losses to average net assets |  |  | 17.49% | 18.95% |  |  |  |
Portfolio turnover rate |  |  | 13.73% | 17.20% |  |  |  |
Weighted average debt outstanding |  |  | $ 1,675,984 | $ 1,614,522 |  |  |  |
Weighted average debt per common share (in dollars per share) |  |  | $ 10.53 | $ 11.69 |  |  |  |
Net Investment Income |  |  |  |  |  |  |  |
Per share data |  |  |  |  |  |  |  |
Net gain (loss) (in dollars per share) |  |  | 1.02 | 1.02 |  |  |  |
Net realized gain (loss) |  |  |  |  |  |  |  |
Per share data |  |  |  |  |  |  |  |
Net gain (loss) (in dollars per share) |  |  | 0.01 | 0.06 |  |  |  |
Net unrealized appreciation (depreciation) |  |  |  |  |  |  |  |
Per share data |  |  |  |  |  |  |  |
Net gain (loss) (in dollars per share) |  |  | $ (0.20) | $ 0.29 |  |  |  |

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