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 |
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| Per Share Data: | |||||||||||||||
| NAV, beginning of period | [1] | $ 79.27 | $ 85.41 | $ 90.58 | $ 95.68 | $ 95.37 | |||||||||
| Net investment income | [1] | 7.82 | 10.2 | 11.74 | 11.39 | 9.27 | |||||||||
| Net realized and unrealized gains (losses) | [1],[2] | (2.09) | (5.07) | (4) | (5.15) | 1.77 | |||||||||
| (Provision) benefit for taxes on realized and unrealized gains (losses) on investments | [1] | (0.11) | (0.08) | (0.02) | (0.01) | ||||||||||
| Net increase in Members' Capital from operations | [1],[2] | 5.73 | 5.02 | 7.66 | 6.22 | 11.03 | |||||||||
| From net investment income | [1] | (10.34) | (10.63) | (12.83) | (11.32) | (10.72) | |||||||||
| From capital gains | [1] | (0.53) | |||||||||||||
| From return of capital | [1] | (6.04) | |||||||||||||
| Total distributions recorded | [1] | (16.38) | (11.16) | (12.83) | (11.32) | (10.72) | |||||||||
| Total increase (decrease) in Members' Capital | [1] | (10.65) | (6.14) | (5.17) | (5.1) | 0.31 | |||||||||
| NAV, end of period | $ 68.62 | $ 79.27 | [1] | $ 85.41 | [1] | $ 90.58 | [1] | $ 95.68 | [1] | ||||||
| Units outstanding, end of period | [1] | 13,854,750 | 13,854,750 | 13,854,750 | 13,694,584 | 10,296,662 | |||||||||
| Weighted average units outstanding, Basic | [1] | 13,854,750 | 13,854,750 | 13,789,367 | 11,460,227 | 7,918,529 | |||||||||
| Weighted average units outstanding, Diluted | [1] | 13,854,750 | 13,854,750 | 13,789,367 | 11,460,227 | 7,918,529 | |||||||||
| Total return based on NAV | [1],[3] | 7.23% | 5.88% | 8.46% | 6.50% | 11.57% | |||||||||
| Supplemental Data/Ratio: | |||||||||||||||
| Members' Capital, end of period | $ 950,692 | $ 1,098,329 | $ 1,183,278 | $ 1,240,510 | $ 985,148 | ||||||||||
| Ratio of expenses (without incentive fees and interest and other debt expenses) to average Members' Capital | 1.86% | 1.89% | 1.88% | 1.93% | 2.08% | ||||||||||
| Ratio of interest and other debt expenses to average Members' Capital | 5.50% | 9.41% | 10.07% | 6.89% | 4.28% | ||||||||||
| Ratio of incentive fees to average Members' Capital | 1.30% | 1.06% | 1.50% | 1.12% | 2.70% | ||||||||||
| Ratio of total expenses to average Members' Capital | 8.66% | 12.36% | 13.45% | 9.94% | 9.06% | ||||||||||
| Ratio of net investment income to average Members' Capital | 10.06% | 12.17% | 13.05% | 11.95% | 9.50% | ||||||||||
| Portfolio turnover | 4.00% | 21.00% | 8.00% | 14.00% | 29.00% | ||||||||||
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