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Consolidated Statements Of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income
Balance, beginning of period, shares at Dec. 31, 2022   1,897    
Balance, beginning of period at Dec. 31, 2022 $ 241,011 $ 0 $ 240,811 $ 200
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 15,850   15,850  
Dividends paid (2,616)   (2,616)  
Repurchases of common stock (in shares)   (7)    
Repurchases of common stock (959)   (959)  
Exercise of stock appreciation rights (in shares)   1    
Exercise of stock appreciation rights 0   0  
Share-based compensation expense related to stock appreciation rights 337   337  
Accumulated postretirement benefit obligation adjustment 100     100
Net unrealized gain (loss) on investments (1,055)     (1,055)
Balance, end of period, shares at Sep. 30, 2023   1,891    
Balance, end of period at Sep. 30, 2023 252,668 $ 0 253,423 (755)
Balance, beginning of period, shares at Jun. 30, 2023   1,891    
Balance, beginning of period at Jun. 30, 2023 247,253 $ 0 247,092 161
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 7,084   7,084  
Dividends paid (870)   (870)  
Share-based compensation expense related to stock appreciation rights 117   117  
Accumulated postretirement benefit obligation adjustment (6)     (6)
Net unrealized gain (loss) on investments (910)     (910)
Balance, end of period, shares at Sep. 30, 2023   1,891    
Balance, end of period at Sep. 30, 2023 252,668 $ 0 253,423 (755)
Balance, beginning of period, shares at Dec. 31, 2023   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, shares at Sep. 30, 2024   1,884    
Balance, end of period at Sep. 30, 2024 271,313 $ 0 270,225 1,088
Balance, beginning of period, shares at Jun. 30, 2024   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, shares at Sep. 30, 2024   1,884    
Balance, end of period at Sep. 30, 2024 $ 271,313 $ 0 $ 270,225 $ 1,088