Financial Highlights - Schedule of Financial Highlights of the Company (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
[4] | Dec. 31, 2018 |
Dec. 31, 2017 |
[4] | Dec. 31, 2016 |
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| Per Share Data: | ||||||||||||||||||||||||||||||||||||||||||||
| NAV, beginning of period | $ 13.41 | [1],[2] | $ 14.62 | [1],[2] | $ 14.61 | [2] | $ 15.86 | [2] | $ 15.91 | [2],[3] | $ 16.75 | [3],[4] | $ 17.65 | [3] | $ 18.09 | [3],[4] | $ 18.31 | [3] | $ 18.97 | [3],[4] | ||||||||||||||||||||||||
| Net investment income | 1.57 | [2] | 2.2 | [2] | 2.28 | [2] | 2.24 | [2] | 2.33 | [2] | 2.04 | [3] | 1.98 | [3] | 2.06 | [3],[4] | 2.07 | [3] | 2.1 | [3],[4] | ||||||||||||||||||||||||
| Net realized and unrealized gains (losses) | (0.54) | [2],[5] | (1.64) | [2],[5] | (0.48) | [2],[5] | (1.7) | [2],[5],[6] | (0.43) | [2],[5] | (0.2) | [3],[7] | (1.08) | [3],[7] | (0.7) | [3],[4],[7] | (0.8) | [3],[7] | (0.98) | [3],[4],[7] | ||||||||||||||||||||||||
| (Provision) benefit for taxes on realized and unrealized gains (losses) on investments | (0.01) | [2],[8] | (0.02) | [3],[4] | ||||||||||||||||||||||||||||||||||||||||
| Net increase (decrease) in net assets from operations | 1.03 | [2] | 0.56 | [2] | 1.79 | [2] | 0.54 | [2] | 1.9 | [2] | 1.84 | [3] | 0.9 | [3] | 1.34 | [3],[4] | 1.27 | [3] | 1.12 | [3],[4] | ||||||||||||||||||||||||
| Issuance of common stock in connection with the Merger | [3] | (0.88) | ||||||||||||||||||||||||||||||||||||||||||
| Repurchases of common stock, including commissions and direct acquisition costs | [2] | 0.08 | ||||||||||||||||||||||||||||||||||||||||||
| Issuance of common stock, net of underwriting and offering costs | 0.03 | [2] | 0.02 | [2] | 0.01 | [2],[6] | 0.31 | [3] | ||||||||||||||||||||||||||||||||||||
| Equity component of convertible notes | [3],[4] | 0.02 | 0.02 | |||||||||||||||||||||||||||||||||||||||||
| Distributions to common stockholders | (1.88) | [2] | (1.8) | [2] | (1.8) | [2] | (1.8) | [2] | (1.95) | [2] | (1.8) | [3] | (1.8) | [3] | (1.8) | [3],[4] | (1.8) | [3] | (1.8) | [3],[4] | ||||||||||||||||||||||||
| Total increase (decrease) in net assets | (0.77) | [2] | (1.21) | [2] | 0.01 | [2] | (1.25) | [2] | (0.05) | [2] | (0.84) | [3] | (0.9) | [3] | (0.44) | [3],[4] | (0.22) | [3] | (0.66) | [3],[4] | ||||||||||||||||||||||||
| NAV, end of period | 12.64 | [1],[2] | 13.41 | [1],[2] | 14.62 | [1],[2] | 14.61 | [2] | 15.86 | [2] | 15.91 | [2],[3] | 16.75 | [3] | 17.65 | [3],[4] | 18.09 | [3] | 18.31 | [3],[4] | ||||||||||||||||||||||||
| Market price, end of period | $ 9.28 | [2] | $ 12.1 | [2] | $ 14.65 | [2] | $ 13.72 | [2] | $ 19.16 | [2] | $ 19.12 | [3] | $ 21.28 | [3] | $ 18.38 | [3],[4] | $ 22.18 | [3] | $ 23.52 | [3],[4] | ||||||||||||||||||||||||
| Shares outstanding, end of period | 112,569,067 | [2] | 117,297,222 | [2] | 109,563,525 | [2] | 102,850,589 | [2] | 101,818,811 | [2] | 101,534,370 | [3] | 40,367,071 | [3] | 40,227,625 | [3],[4] | 40,130,665 | [3] | 36,331,662 | [3],[4] | ||||||||||||||||||||||||
| Weighted average shares outstanding, basic | 115,576,890 | [2] | 114,673,460 | [2] | 108,305,428 | [2] | 102,258,701 | [2] | 101,691,076 | [2] | 53,940,573 | [3] | 40,313,662 | [3] | 40,184,715 | [3],[4] | 38,633,652 | [3] | 36,317,131 | [3],[4] | ||||||||||||||||||||||||
| Weighted average shares outstanding, diluted | 115,576,890 | [2] | 114,673,460 | [2] | 108,305,428 | [2] | 102,258,701 | [2] | 101,691,076 | [2] | 53,940,573 | [3] | 40,313,662 | [3] | 40,184,715 | [3],[4] | 38,633,652 | [3] | 36,317,131 | [3],[4] | ||||||||||||||||||||||||
| Total return based on NAV | 12.18% | [2],[9] | 4.12% | [2],[9] | 13.35% | [2],[9] | 2.80% | [2],[9] | 10.67% | [2],[9] | 6.78% | [3],[10] | 4.08% | [3],[10] | 6.96% | [3],[4],[10] | 7.17% | [3],[10] | 5.42% | [3],[4],[10] | ||||||||||||||||||||||||
| Total return based on market value | (8.73%) | [2],[11] | (6.25%) | [2],[11] | 20.95% | [2],[11] | (20.09%) | [2],[11] | 11.26% | [2],[11] | 1.00% | [3],[12] | 26.98% | [3],[12] | (9.16%) | [3],[4],[12] | 2.30% | [3],[12] | 35.20% | [3],[4],[12] | ||||||||||||||||||||||||
| Supplemental Data/Ratio: | ||||||||||||||||||||||||||||||||||||||||||||
| Net assets, end of period | $ 1,423,019 | $ 1,572,700 | $ 1,601,825 | $ 1,502,394 | $ 1,614,400 | $ 1,615,141 | $ 676,125 | $ 709,892 | [4] | $ 725,830 | $ 665,137 | [4] | ||||||||||||||||||||||||||||||||
| Ratio of net expenses to average net assets | 12.25% | 11.39% | 13.17% | 8.19% | 6.75% | 7.62% | 9.77% | 8.81% | [4] | 8.07% | 7.25% | [4] | ||||||||||||||||||||||||||||||||
| Ratio of net expenses before voluntary waivers to average net assets | 12.25% | 11.39% | 13.29% | 8.93% | 8.42% | 9.30% | 9.77% | 8.81% | [4] | 8.07% | 7.25% | [4] | ||||||||||||||||||||||||||||||||
| Ratio of net expenses (without incentive fees and interest and other debt expenses) to average net assets | 3.07% | 3.19% | 3.10% | 3.10% | 2.53% | 2.48% | 3.24% | 3.26% | [4] | 3.47% | 3.58% | [4] | ||||||||||||||||||||||||||||||||
| Ratio of interest and other debt expenses to average net assets | 7.43% | 7.12% | 7.06% | 5.05% | 3.63% | 4.82% | 5.25% | 3.62% | [4] | 2.79% | 2.12% | [4] | ||||||||||||||||||||||||||||||||
| Ratio of net incentive fees to average net assets | 1.75% | 1.08% | 3.01% | 0.04% | 0.59% | 0.32% | 1.28% | 1.93% | [4] | 1.81% | 1.55% | [4] | ||||||||||||||||||||||||||||||||
| Ratio of total expenses to average net assets | 12.25% | 11.39% | 13.29% | 8.93% | 8.70% | 12.09% | 9.82% | 8.81% | [4] | 8.07% | 7.25% | [4] | ||||||||||||||||||||||||||||||||
| Ratio of net investment income to average net assets | 12.09% | 15.82% | 15.68% | 14.52% | 14.62% | 13.28% | 11.53% | 11.42% | [4] | 11.36% | 11.30% | [4] | ||||||||||||||||||||||||||||||||
| Portfolio turnover | 32.00% | 30.00% | 15.00% | 20.00% | 48.00% | 24.00% | 45.00% | 26.00% | [4] | 45.00% | 17.00% | [4] | ||||||||||||||||||||||||||||||||
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