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Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Investment Company, Financial Highlights [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset value, beginning balance (in dollars per share) | $ 15.73 |  | $ 16.08 | $ 16.05 | $ 16.23 |  | $ 15.80 |  | $ 15.31 | $ 15.11 | $ 15.98 | $ 16.23 |  | $ 15.98 |  | $ 16.34 | $ 15.50 | $ 16.80
Net investment income (loss) (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 1.79 |  | 1.92 |  | 1.56 | 1.31 | 1.39
Net realized (loss) gain and net change in unrealized (depreciation) appreciation on investments and (loss) gain on foreign currency (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | (1.16) |  | (0.18) |  | (0.68) | 0.79 | (1.57)
Total net increase (decrease) (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 0.63 |  | 1.74 |  | 0.88 | 2.10 | (0.18)
Shareholder distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared to stockholders from net investment income (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | (1.52) |  | (1.61) |  | (1.44) | (1.26) | (1.12)
Capital share transactions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock below net asset value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 0.09 |  | 0.12 |  | 0.20 | 0 | 0
Net increase in net assets resulting from capital share transactions (in dollars per share) | 15.43 |  | 15.73 | 16.08 | 16.05 |  | 16.23 |  | 15.80 | 15.31 | 15.11 | 0.09 |  | 0.12 |  | 0.20 | 0 | 0
Net asset value, ending balance (in dollars per share) | $ 15.43 |  | $ 15.73 | $ 16.08 | $ 16.05 |  | $ 16.23 |  | $ 15.80 | $ 15.31 | $ 15.11 | $ 15.43 |  | $ 16.23 |  | $ 15.98 | $ 16.34 | $ 15.50
Shares outstanding at end of period (in shares) | 53,189,269 |  |  |  |  |  | 54,184,636 |  |  |  |  | 53,189,269 |  | 54,184,636 |  | 55,299,484 | 56,958,440 | 56,646,867
Total investment return-net value |  |  |  |  |  |  |  |  |  |  |  | 7.71% |  | 17.00% |  | 10.44% | 14.43% | (0.94%)
Total investment return-market asset value |  |  |  |  |  |  |  |  |  |  |  | 14.37% |  | 34.33% |  | (14.87%) | 3.87% | 0.00%
Net assets at beginning of period |  |  |  |  | $ 879,563 | [1] |  |  |  |  | $ 883,634 | $ 879,563 | [1] | $ 883,634 |  | $ 930,512 | $ 878,256 | $ 952,563
Net assets at end of period | $ 820,810 | [2] |  |  |  |  | $ 879,563 | [1] |  |  |  | 820,810 | [2] | 879,563 | [1] | 883,634 | 930,512 | 878,256
Average net assets for the period |  |  |  |  |  |  |  |  |  |  |  | $ 861,376 |  | $ 864,886 |  | $ 917,781 | $ 918,824 | $ 875,846
Ratio/Supplemental data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of net investment income to average net assets |  |  |  |  |  |  |  |  |  |  |  | 11.13% |  | 12.14% |  | 9.61% | 8.09% | 8.99%
Ratio of net operating expenses to average net assets |  |  |  |  |  |  |  |  |  |  |  | 18.18% |  | 16.88% |  | 11.63% | 9.04% | 9.72%
Portfolio turnover |  |  |  |  |  |  |  |  |  |  |  | 25.85% |  | 17.43% |  | 26.81% | 52.04% | 22.99%
Total amount of senior securities outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 1,117,344 |  | $ 1,092,344 |  | $ 957,500 | $ 830,000 | $ 725,000
Asset coverage ratio | 173.00% |  |  |  |  |  | 181.00% |  |  |  |  | 173.00% |  | 181.00% |  | 192.00% | 212.00% | 221.00%
Repurchase of shares, per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01
Number of shares (in shares) | 1 |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
[1] | Fair value determined in good faith by the Company’s board of directors (see Note 9), including via delegation to CIM as the Company’s valuation designee (see Note 2), using significant unobservable inputs unless otherwise noted.
[2] | Fair value determined in good faith by the Company’s board of directors (see Note 9), including via delegation to CIM as the Company’s valuation designee (see Note 2), using significant unobservable inputs unless otherwise noted.

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