Annual report pursuant to Section 13 and 15(d)

Financial Highlights (Details)

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Financial Highlights (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Per share data          
Net asset value at beginning of period (in dollars per share) $ 10.53 $ 11.22 $ 11.26 $ 10.55 $ 9.90
Total from investment operations (in dollars per share) 2.34 0.81 1.50 2.02 1.71
Net increase (decrease) in net assets from capital share transactions (in dollars per share) 0.44 0.34 (0.08) 0.01 0.20
Distributions of net investment income (in dollars per share) (1.93) (1.63) (1.06) (1.03) (1.15)
Distributions of capital gains (in dollars per share) 0 (0.36) (0.49) (0.36) (0.18)
Stock-based compensation expense included in net investment income and other movements (in dollars per share) 0.05 0.15 0.09 0.07 0.07
Net asset value at ending of period (in dollars per share) 11.43 10.53 11.22 11.26 10.55
Ratios and supplemental data:          
Per share market value at end of period (in dollars per share) $ 16.67 $ 13.22 $ 16.59 $ 14.42 $ 14.02
Total return 42.00% (10.14%) 25.62% 14.31% 39.36%
Shares outstanding at end of period (in shares) 157,758 133,045 116,619 114,726 107,364
Basic weighted average common shares outstanding (in shares) 144,091 125,189 114,742 111,985 101,132
Net assets at end of period $ 1,802,706 $ 1,401,459 $ 1,308,547 $ 1,291,704 $ 1,133,049
Ratio of total expense to average net assets 9.92% 9.92% 9.86% 11.30% 11.95%
Ratio of net investment income before investment gains and losses to average net assets 19.26% 13.96% 11.28% 13.64% 13.74%
Portfolio turnover rate 31.95% 19.29% 51.58% 32.38% 31.30%
Weighted average debt outstanding $ 1,607,278 $ 1,468,335 $ 1,248,177 $ 1,309,903 $ 1,177,379
Weighted average debt per common share (in dollars per share) $ 11.15 $ 11.73 $ 10.88 $ 11.70 $ 11.64
Net investment income          
Per share data          
Net gain (loss) (in dollars per share) 2.11 1.50 1.29 1.39 1.41
Net realized gain (loss)          
Per share data          
Net gain (loss) (in dollars per share) 0.06 (0.01) 0.18 (0.50) 0.16
Net unrealized appreciation (depreciation)          
Per share data          
Net gain (loss) (in dollars per share) $ 0.17 $ (0.68) $ 0.03 $ 1.13 $ 0.14