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Stockholders' Equity - Summary of Components of Stockholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Beginning balance | $ 196,429 | [1] | $ 210,607 |  | $ 213,518 | [1] | $ 215,013 | [1] | $ 225,106 |  | $ 232,123 | [1] | $ 213,518 | [1] | $ 232,123 | [1]
Net investment income | 5,802 |  | 6,477 |  | 6,226 |  | 7,166 |  | 7,915 |  | 8,529 |  |  |  |  |
Net change in unrealized appreciation on investments | 4,511 |  | (5,966) |  | 71 |  | 1,708 |  | (4,176) |  | (5,960) |  | (1,384) |  | (8,428) |
Net realized (losses) from investment transactions and extinguishment of debt | (11,822) |  | (6,961) |  | (2,270) |  | (1,693) |  | (6,689) |  | (3,085) |  |  |  |  |
Tax (provision) benefit on realized and unrealized gains (losses) on investments |  |  | 78 |  | 459 |  | 264 | [1] | (164) |  | 571 |  | 537 | [1] | 671 | [1]
Distributions to Stockholders | (6,382) | [1] | (6,411) |  | (6,444) |  | (6,554) | [1] | (6,579) |  | (6,495) |  | (19,237) | [1] | (19,628) | [1]
Reinvested Dividends | 82 | [1] | 158 |  | 0 |  | 73 | [1] | 153 |  | 215 |  | 240 | [1] | 440 | [1]
Stock repurchases | (638) | [1] | (1,553) |  | (953) |  | (1,222) | [1] | (553) |  | (792) |  | (3,144) | [1] | (2,566) | [1]
Ending balance | 187,982 | [1],[2] | 196,429 | [1] | 210,607 |  | 214,755 | [1],[2] | 215,013 | [1] | 225,106 |  | 187,982 | [1],[2] | 214,755 | [1],[2]
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | 93 |  | 93 |  | 94 |  | 95 |  | 96 |  | 96 |  | 94 |  | 96 |
Stock repurchases | (1) |  |  |  | (1) |  |  |  | (1) |  |  |  |  |  |  |
Ending balance | 92 |  | 93 |  | 93 |  | 95 |  | 95 |  | 96 |  | 92 |  | 95 |
Capital in Excess of Par Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | 715,488 |  | 716,883 |  | 717,835 |  | 735,808 |  | 736,207 |  | 736,784 |  | 717,835 |  | 736,784 |
Reinvested Dividends | 82 |  | 158 |  |  |  | 73 |  | 153 |  | 215 |  |  |  |  |
Stock repurchases | (637) |  | (1,553) |  | (952) |  | (1,222) |  | (552) |  | (792) |  |  |  |  |
Ending balance | 714,933 |  | 715,488 |  | 716,883 |  | 734,659 |  | 735,808 |  | 736,207 |  | 714,933 |  | 734,659 |
Total Distributable (Loss) Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | (519,152) |  | (506,369) |  | (504,411) |  | (520,890) |  | (511,197) |  | (504,757) |  | (504,411) |  | (504,757) |
Net investment income | 5,802 |  | 6,477 |  | 6,226 |  | 7,166 |  | 7,915 |  | 8,529 |  |  |  |  |
Net change in unrealized appreciation on investments | 4,511 |  | (5,966) |  | 71 |  | 1,708 |  | (4,176) |  | (5,960) |  |  |  |  |
Net realized (losses) from investment transactions and extinguishment of debt | (11,822) |  | (6,961) |  | (2,270) |  | (1,693) |  | (6,689) |  | (3,085) |  |  |  |  |
Tax (provision) benefit on realized and unrealized gains (losses) on investments |  |  | 78 |  | 459 |  | 264 |  | (164) |  | 571 |  |  |  |  |
Distributions to Stockholders | (6,382) |  | (6,411) |  | (6,444) |  | (6,554) |  | (6,579) |  | (6,495) |  |  |  |  |
Ending balance | $ (527,043) |  | $ (519,152) |  | $ (506,369) |  | $ (519,999) |  | $ (520,890) |  | $ (511,197) |  | $ (527,043) |  | $ (519,999) |
[1] | Refer to Note 9 “Stockholders' Equity” for additional information on changes in components of Stockholders' Equity.
[2] | Totals may not sum due to rounding.

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