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Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Per share data: |  |  |  |  |  |  |  |  |  |
Net asset value per share, beginning balance (in dollars per share) | $ 11.05 | $ 11.36 | $ 10.99 | $ 11.66 | $ 10.98 | $ 13.43 | $ 15.13 | $ 15.23 | $ 16.11 | $ 16.10
Net investment income (in dollars per share) | 1.19 | 1.12 | 0.90 | 0.64 | 0.61 | 0 | 1.55 | 1.62 | 2.16 | 2.08
Net realized gain (loss) on investments / foreign currency transactions / forward currency contracts (in dollars per share) | (0.59) | 0.16 | (0.05) | (0.79) | (0.08) | (3.17) | (1.11) | 0.05 | (0.83) | 0.46
Net unrealized appreciation (depreciation) on investments / CSAs / foreign currency transactions / forward currency contracts (in dollars per share) | 0.59 | (1.20) | 0.34 | 0.38 | 0.64 | 1.08 | (1.04) | (0.72) | 0.17 | (1.48)
Total increase (decrease) from investment operations (in dollars per share) | 1.19 | 0.08 | 1.19 | 0.23 | 1.17 | (2.09) | (0.60) | 0.95 | 1.50 | 1.06
Dividends/distributions paid to stockholders from net investment income (in dollars per share) | (1.02) | (0.95) | (0.79) | (0.65) | (0.54) | (0.41) | (1.65) | (1.89) | (2.11) | (1.88)
Dividends paid to stockholders from realized gains (in dollars per share) |  |  |  |  |  | 0 | 0 | 0 | (0.25) | (0.68)
Tax return of capital to stockholders (in dollars per share) | 0 | 0 | (0.03) | 0 | 0 | (0.02) | 0 | 0 | 0 | 0
Total dividends and distributions paid (in dollars per share) | (1.02) | (0.95) | (0.82) | (0.65) | (0.54) | (0.43) | (1.65) | (1.89) | (2.36) | (2.56)
Common stock offerings (in dollars per share) |  |  |  | (0.63) |  |  |  |  |  |
Common stock offerings (in dollars per share) | 0 | 0 | 0 |  | 0 | 0 | 0.61 | 0.72 | 0 | 1.49
Purchase of shares in tender offer (in dollars per share) |  |  |  |  |  | 0.13 | 0 | 0 | 0 | 0
Stock-based compensation (in dollars per share) |  |  |  |  |  | 0.17 | (0.01) | 0.09 | 0.01 | 0
Shares issued pursuant to Dividend Reinvestment Plan (in dollars per share) |  |  |  |  |  | 0 | 0.01 | 0.04 | 0.03 | 0.04
Sierra Merger (in dollars per share) | 0 | 0.10 | 0 | 0 | 0 |  |  |  |  |
Deemed contribution -CSA (in dollars per share) | 0 | 0.40 | 0 | 0.28 | 0 |  |  |  |  |
Deemed contribution - Barings LLC (in dollars per share) | 0 | 0 | 0 | 0.07 | 0 |  |  |  |  |
Purchases of shares in share repurchase plan (in dollars per share) | 0.06 | 0.06 | 0 | 0.05 | 0.07 |  |  |  |  |
Loss on extinguishment of debt (in dollars per share) | 0 | 0 | 0 | 0.06 | 0.01 | (0.21) | 0 | 0 | (0.04) | 0
Benefit from (provision for) taxes (in dollars per share) | 0 | 0 | 0 | 0 | 0.01 | 0.02 | (0.02) | (0.01) | (0.01) | (0.10)
Other (in dollars per share) | 0 | 0 | 0 | (0.04) | 0 | (0.04) | (0.04) | 0 | (0.01) | 0.08
Net asset value per share, ending balance (in dollars per share) | 11.28 | 11.05 | 11.36 | 10.99 | 11.66 | 10.98 | 13.43 | 15.13 | 15.23 | 16.11
Market value at end of period (in dollars per share) | $ 8.58 | $ 8.15 | $ 11.02 | $ 9.20 | $ 10.28 | $ 9.01 | $ 9.49 | $ 18.34 | $ 19.11 | $ 20.29
Shares outstanding at end of period (in shares) | 106,067,070 | 107,916,166 | 65,316,085 | 65,316,085 | 48,950,803 | 51,284,064 | 47,740,832 | 40,401,292 | 33,375,126 | 32,950,288
Net assets at end of period | $ 1,196,559 | $ 1,192,329 | $ 741,931 | $ 717,805 | $ 570,875 | $ 562,967 | $ 641,275 | $ 611,156 | $ 508,368 | $ 530,827
Average net assets | $ 1,211,289 | $ 1,184,591 | $ 739,250 | $ 517,740 | $ 579,199 | $ 628,155 | $ 667,188 | $ 556,549 | $ 524,580 | $ 482,679
Ratio of total expenses, prior to waiver of base management fee, including loss on extinguishment of debt and benefit from (provision for) taxes, to average net assets | 13.30% | 8.80% | 10.33% | 8.33% | 7.90% | 14.54% | 7.74% | 9.93% | 9.81% | 9.45%
Ratio of total expenses, net of base management fee waived, including loss on extinguishment of debt and benefit from (provision for) taxes, to average net assets |  |  |  |  |  | 14.31% | 7.74% | 9.93% | 9.81% | 9.45%
Ratio of net investment income to average net assets | 10.55% | 9.76% | 7.98% | 5.99% | 5.27% | (0.01%) | 10.83% | 10.58% | 13.65% | 12.85%
Portfolio turnover ratio | 22.93% | 43.07% | 68.63% | 67.80% | 113.99% | 228.49% | 37.02% | 24.61% | 37.62% | 29.21%
Total return | 18.83% | (18.35%) | 29.34% | (2.17%) | 20.27% | 18.18% | (42.15%) | 5.86% | 5.82% | (17.36%)

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