Annual report [Section 13 and 15(d), not S-K Item 405]

Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details)

v3.25.4
Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator                    
Net increase (decrease) in net assets resulting from operations $ 339,737 $ 262,966 $ 337,484              
Capital gains 335,263 312,244 278,301              
Numerator for basic change in net assets per common share 337,025 260,135 334,141              
Numerator for diluted change in net assets per common share 350,199 260,135 334,141              
Total Earnings (loss), net of total distributions $ 4,474 $ (49,278) $ 59,183              
Denominator                    
Basic weighted average common shares outstanding (in shares) 177,392 161,082 144,091 125,189 114,742 111,985 101,132 90,929 82,519 73,753
Common shares issuable (in shares) 610 517 735              
Weighted average common shares outstanding assuming dilution (in shares) 188,861 161,599 144,826              
Change in net assets per common share:                    
Basic (in dollars per share) $ 1.90 $ 1.61 $ 2.32              
Diluted (in dollars per share) $ 1.85 $ 1.61 $ 2.31              
2028 Convertible Notes                    
Numerator                    
Add: Income impact of assumed conversion of 2028 Convertible Notes $ 13,174 $ 0 $ 0              
Denominator                    
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 10,859 0 0              
Common Stock                    
Numerator                    
Capital gains $ 332,587 $ 309,413 $ 275,548              
Earnings (loss), net of distributions attributable to common shares $ 4,438 $ (49,278) $ 58,593