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Financial Highlights - Schedule of Financial Highlights of the Company (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Net investment income before investment gains and losses per common share: |  |  |  |  |  |
Net Asset Value Per Share, Beginning Balance |  |  |  | $ 10.53 | $ 11.22 | $ 11.22
Net investment income before investment gains and losses per common share: Basic |  | $ 0.53 | $ 0.32 | 1.01 | 0.62 |
Total from investment operations | [1] |  |  | 1.37 | (0.12) |
Investment Company, Share Issuance, Per Share | [1] |  |  |  | 0.23 |
Investment Company, Share Repurchase, Per Share | [1] |  |  | (0.01) |  |
Distributions of net investment income |  | (0.47) | (0.48) | (0.94) | (0.96) | (1.97)
Stock-based compensation expense included in net investment income and other movements | [1],[2] |  |  | 0.03 | 0.06 |
Net Asset Value Per Share, Ending Balance |  | 10.96 | 10.43 | 10.96 | 10.43 | $ 10.53
Ratios and supplemental data (in thousands, except per share data): |  |  |  |  |  |
Per share market value at end of period |  | $ 14.8 | $ 13.49 | $ 14.8 | $ 13.49 |
Total return | [3] |  |  | 19.55% | (13.72%) |
Shares outstanding at end of period |  | 144,641 | 127,285 | 144,641 | 127,285 |
Basic |  | 141,390 | 124,255 | 138,338 | 121,292 |
Net assets at end of period |  | $ 1,585,510 | $ 1,327,740 | $ 1,585,510 | $ 1,327,740 | $ 1,401,459
Ratio of total expense to average net assets | [4] |  |  | 10.75% | 9.13% |
Ratio of net investment income before investment gains and losses to average net assets | [4] |  |  | 18.95% | 11.30% |
Investment Company, Portfolio Turnover | [5] |  |  | 17.20% | 8.88% |
Weighted average debt outstanding |  |  |  | $ 1,614,522 | $ 1,386,242 |
Weighted average debt per common share |  |  |  | $ 11.69 | $ 11.43 |
Realized |  |  |  |  |  |
Net investment income before investment gains and losses per common share: |  |  |  |  |  |
Net gain (loss) | [1] |  |  | 0.06 | (0.04) |
Unrealized |  |  |  |  |  |
Net investment income before investment gains and losses per common share: |  |  |  |  |  |
Net gain (loss) | [1] |  |  | 0.29 | (0.7) |
Net Investment Income |  |  |  |  |  |
Net investment income before investment gains and losses per common share: |  |  |  |  |  |
Net gain (loss) | [1] |  |  | 1.02 | 0.62 |
Ordinary Income |  |  |  |  |  |
Net investment income before investment gains and losses per common share: |  |  |  |  |  |
Distributions of net investment income | [1],[6] |  |  | $ (0.96) | $ (0.96) |
[1] | All per share activity is calculated based on the weighted average shares outstanding for the relevant period, except net increase (decrease) in net assets from capital share transactions, which is based on the common shares outstanding as of the relevant balance sheet date.
[2] | Adjusts for the impact of stock-based compensation expense, which is a non-cash expense and has no net impact to net asset value. Pursuant to ASC Topic 718, the expense is offset by a corresponding increase in paid-in capital. Additionally, adjusts for other items attributed to the difference between certain per share data based on the weighted-average basic shares outstanding and those calculated using the shares outstanding as of a period end or transaction date.
[3] | The total return for the six months ended June 30, 2023, and 2022 equals the change in the ending market value over the beginning of the period price per share plus distributions paid per share during the period, divided by the beginning price assuming the distribution is reinvested on the date of the distribution. As such, the total return is not annualized. The total return does not reflect any sales load that must be paid by investors.
[4] | The ratios are calculated based on weighted average net assets for the relevant period and are annualized.
[5] | The portfolio turnover rate for the six months ended June 30, 2023, and 2022 equals the lesser of investment portfolio purchases or sales during the period, divided by the average investment portfolio value during the period. As such, portfolio turnover rate is not annualized.
[6] | Includes distributions on unvested restricted stock awards.

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