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Consolidated Statements Of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Shares, outstanding   1,891    
Balance, beginning of period at Dec. 31, 2023 $ 251,553 $ 0 $ 250,915 $ 638
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 22,711   22,711  
Dividends paid (2,600)   (2,600)  
Repurchases of common stock (in shares)   (7)    
Repurchases of common stock (1,098)   (1,098)  
Exercise of stock appreciation rights (in shares)   0    
Exercise of stock appreciation rights 1   1  
Share-based compensation expense related to stock appreciation rights 296   296  
Accumulated postretirement benefit obligation adjustment 0      
Net unrealized gain (loss) on investments 450     450
Balance, end of period at Sep. 30, 2024 271,313 $ 0 270,225 1,088
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Shares, outstanding   1,884    
Balance, beginning of period at Jun. 30, 2024 261,816 $ 0 261,648 168
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 9,315   9,315  
Dividends paid (867)   (867)  
Exercise of stock appreciation rights (in shares)   0    
Exercise of stock appreciation rights 1   1  
Share-based compensation expense related to stock appreciation rights 128   128  
Net unrealized gain (loss) on investments 920     920
Balance, end of period at Sep. 30, 2024 271,313 $ 0 270,225 1,088
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Shares, outstanding   1,884    
Shares, outstanding   1,886    
Balance, beginning of period at Dec. 31, 2024 251,773 $ 0 251,418 355
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 27,663   27,663  
Dividends paid (2,604)   (2,604)  
Exercise of stock appreciation rights (in shares)   2    
Exercise of stock appreciation rights 0   0  
Share-based compensation expense related to stock appreciation rights 399   399  
Accumulated postretirement benefit obligation adjustment 47     47
Net unrealized gain (loss) on investments 734     734
Balance, end of period at Sep. 30, 2025 278,012 $ 0 276,876 1,136
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Shares, outstanding   1,888    
Balance, beginning of period at Jun. 30, 2025 266,177 $ 0 265,355 822
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 12,214   12,214  
Dividends paid (868)   (868)  
Exercise of stock appreciation rights (in shares)   0    
Exercise of stock appreciation rights 0   0  
Share-based compensation expense related to stock appreciation rights 175   175  
Accumulated postretirement benefit obligation adjustment (3)     (3)
Net unrealized gain (loss) on investments 317     317
Balance, end of period at Sep. 30, 2025 $ 278,012 $ 0 $ 276,876 $ 1,136
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Shares, outstanding   1,888