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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 | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Net investment income before investment gains and losses per common share: |  |  |  |  |  |  |  |  |
Net asset value at beginning of period |  |  |  | $ 11.22 | $ 11.26 |  |  |  |
Net investment income before investment gains and losses per common share: Basic |  | $ 0.39 | $ 0.33 | 1.01 | 0.95 |  |  |  |
Total from investment operations |  |  |  | 0.31 | 1.47 |  |  |  |
Investment Company, Issuance of Shares, Per Share | [1] |  |  | 0.31 | (0.11) |  |  |  |
Distributions of net investment income | [2] |  |  |  | (0.09) |  |  |  |
Stock-based compensation expense included in investment income | [3] |  |  | 0.09 | 0.07 |  |  |  |
Net asset value at end of period |  | 10.47 | 11.54 | 10.47 | 11.54 |  |  |  |
Ratios and supplemental data (in thousands, except per share data): |  |  |  |  |  |  |  |  |
Per share market value at end of period |  | $ 11.58 | $ 16.61 | $ 11.58 | $ 16.61 |  |  |  |
Total return | [4] |  |  | (24.34%) | 23.05% |  |  |  |
Shares outstanding at end of period |  | 130,191 | 115,925 | 130,191 | 115,925 |  |  |  |
Basic |  | 127,484 | 114,805 | 123,379 | 114,590 |  |  |  |
Diluted |  | 129,334 | 116,239 | 124,767 | 115,550 |  |  |  |
Net assets at end of period |  | $ (1,362,718) | $ (1,337,532) | $ (1,362,718) | $ (1,337,532) | $ (1,327,740) | $ (1,308,547) | $ (1,356,358) | $ (1,291,704)
Ratio of total expense to average net assets | [5] |  |  | 9.51% | 9.93% |  |  |  |
Ratio of net investment income before investment gains and losses to average net assets | [5] |  |  | 12.53% | 11.01% |  |  |  |
Investment Company, Portfolio Turnover | [6] |  |  | 14.12% | 33.14% |  |  |  |
Weighted average debt outstanding |  |  |  | $ 1,430,814 | $ 1,246,769 |  |  |  |
Weighted average debt per common share |  |  |  | $ 11.60 | $ 10.88 |  |  |  |
Realized |  |  |  |  |  |  |  |  |
Net investment income before investment gains and losses per common share: |  |  |  |  |  |  |  |  |
Net gain (loss) |  |  |  | 0.01 | 0.12 |  |  |  |
Unrealized |  |  |  |  |  |  |  |  |
Net investment income before investment gains and losses per common share: |  |  |  |  |  |  |  |  |
Net gain (loss) |  |  |  | (0.71) | 0.40 |  |  |  |
Capital Gains Member |  |  |  |  |  |  |  |  |
Net investment income before investment gains and losses per common share: |  |  |  |  |  |  |  |  |
Distributions of net investment income | [2] |  |  | (0.35) |  |  |  |  |
Ordinary Income |  |  |  |  |  |  |  |  |
Net investment income before investment gains and losses per common share: |  |  |  |  |  |  |  |  |
Distributions of net investment income | [2] |  |  | $ (1.11) | $ (1.06) |  |  |  |
[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] | Includes distributions on unvested restricted stock awards.
[3] | Stock option expense is a non-cash expense that has no effect on net asset value. Pursuant to ASC Topic 718, net investment income includes the expense associated with the granting of stock options which is offset by a corresponding increase in paid-in capital.
[4] | The total return for the nine months ended September 30, 2022, and 2021, 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.
[5] | The ratios are calculated based on weighted average net assets for the relevant period and are annualized.
[6] | The portfolio turnover rate for the nine months ended September 30, 2022, and 2021, 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.

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