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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Capital in Excess of Par Value
Accumulated Undistributed (Overdistributed) Earnings
Beginning balance (in shares) at Dec. 31, 2023   54,184,636    
Beginning balance at Dec. 31, 2023 $ 879,563 $ 54 $ 1,033,030 $ (153,521)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares)   (424,031)    
Repurchases of common stock (4,670)   (4,670)  
Net investment income 32,593     32,593
Net realized (losses) gains on investments (9,736)     (9,736)
Net unrealized (losses) gains on investments (16,412)     (16,412)
Dividends declared and payable (18,279)     (18,279)
Ending balance (in shares) at Mar. 31, 2024   53,760,605    
Ending balance at Mar. 31, 2024 863,059 $ 54 1,028,360 (165,355)
Beginning balance (in shares) at Dec. 31, 2023   54,184,636    
Beginning balance at Dec. 31, 2023 $ 879,563 $ 54 1,033,030 (153,521)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares) (824,750)      
Repurchases of common stock $ (9,344)      
Net investment income $ 77,174      
Ending balance (in shares) at Sep. 30, 2024 53,359,886 53,359,886    
Ending balance at Sep. 30, 2024 $ 839,190 $ 53 1,023,687 (184,550)
Beginning balance (in shares) at Dec. 31, 2023   54,184,636    
Beginning balance at Dec. 31, 2023 $ 879,563 $ 54 1,033,030 (153,521)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares) (995,367)      
Repurchases of common stock $ (11,347)      
Net investment income $ 95,860      
Ending balance (in shares) at Dec. 31, 2024 53,189,269 53,189,269    
Ending balance at Dec. 31, 2024 $ 820,810 $ 53 1,021,684 (200,927)
Beginning balance (in shares) at Mar. 31, 2024   53,760,605    
Beginning balance at Mar. 31, 2024 863,059 $ 54 1,028,360 (165,355)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares)   (234,982)    
Repurchases of common stock (2,671)   (2,671)  
Net investment income 22,963     22,963
Net realized (losses) gains on investments (20,277)     (20,277)
Net unrealized (losses) gains on investments 19,692     19,692
Dividends declared and payable (21,960)     (21,960)
Ending balance (in shares) at Jun. 30, 2024   53,525,623    
Ending balance at Jun. 30, 2024 860,806 $ 54 1,025,689 (164,937)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares)   (165,737)    
Repurchases of common stock (2,003) $ (1) (2,002)  
Net investment income 21,618     21,618
Net realized (losses) gains on investments 3,938     3,938
Net unrealized (losses) gains on investments (25,935)     (25,935)
Dividends declared and payable $ (19,234)     (19,234)
Ending balance (in shares) at Sep. 30, 2024 53,359,886 53,359,886    
Ending balance at Sep. 30, 2024 $ 839,190 $ 53 1,023,687 (184,550)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares)   (170,617)    
Repurchases of common stock (2,003)   (2,003)  
Net investment income 18,686     18,686
Net realized (losses) gains on investments (2,238)     (2,238)
Net unrealized (losses) gains on investments (10,990)     (10,990)
Dividends declared and payable $ (21,835)     (21,835)
Ending balance (in shares) at Dec. 31, 2024 53,189,269 53,189,269    
Ending balance at Dec. 31, 2024 $ 820,810 $ 53 1,021,684 (200,927)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares)   (185,862)    
Repurchases of common stock (2,172)   (2,172)  
Net investment income 19,252     19,252
Net realized (losses) gains on investments 2,294     2,294
Net unrealized (losses) gains on investments (64,251)     (64,251)
Dividends declared and payable (19,149)     (19,149)
Ending balance (in shares) at Mar. 31, 2025   53,003,407    
Ending balance at Mar. 31, 2025 $ 756,784 $ 53 1,019,512 (262,781)
Beginning balance (in shares) at Dec. 31, 2024 53,189,269 53,189,269    
Beginning balance at Dec. 31, 2024 $ 820,810 $ 53 1,021,684 (200,927)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares) (1,215,751)      
Repurchases of common stock $ (11,984)      
Net investment income $ 74,741      
Ending balance (in shares) at Sep. 30, 2025 51,973,518 51,973,518    
Ending balance at Sep. 30, 2025 $ 772,506 $ 52 1,009,701 (237,247)
Beginning balance (in shares) at Mar. 31, 2025   53,003,407    
Beginning balance at Mar. 31, 2025 756,784 $ 53 1,019,512 (262,781)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares)   (699,565)    
Repurchases of common stock (6,556) $ (1) (6,555)  
Net investment income 16,922     16,922
Net realized (losses) gains on investments (32,376)     (32,376)
Net unrealized (losses) gains on investments 42,770     42,770
Dividends declared and payable (18,934)     (18,934)
Ending balance (in shares) at Jun. 30, 2025   52,303,842    
Ending balance at Jun. 30, 2025 758,610 $ 52 1,012,957 (254,399)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchases of common stock (in shares)   (330,324)    
Repurchases of common stock (3,256) $ 0 (3,256)  
Net investment income 38,567     38,567
Net realized (losses) gains on investments (9,605)     (9,605)
Net unrealized (losses) gains on investments 6,916     6,916
Dividends declared and payable $ (18,726)     (18,726)
Ending balance (in shares) at Sep. 30, 2025 51,973,518 51,973,518    
Ending balance at Sep. 30, 2025 $ 772,506 $ 52 $ 1,009,701 $ (237,247)