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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, 2020   1,892    
Balance, beginning of period at Dec. 31, 2020 $ 200,422 $ 0 $ 196,096 $ 4,326
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 48,108   48,108  
Dividends paid (2,576)   (2,576)  
Exercise of stock appreciation rights (in shares)   2    
Exercise of stock appreciation rights (1)   (1)  
Share-based compensation expense related to stock appreciation rights 206   206  
Accumulated postretirement benefit obligation adjustment 0      
Net unrealized gain (loss) on investments (854)     (854)
Balance, end of period, shares at Sep. 30, 2021   1,894    
Balance, end of period at Sep. 30, 2021 245,305 $ 0 241,833 3,472
Balance, beginning of period, shares at Jun. 30, 2021   1,894    
Balance, beginning of period at Jun. 30, 2021 231,938 $ 0 228,133 3,805
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 14,503   14,503  
Dividends paid (871)   (871)  
Share-based compensation expense related to stock appreciation rights 68   68  
Net unrealized gain (loss) on investments (333)     (333)
Balance, end of period, shares at Sep. 30, 2021   1,894    
Balance, end of period at Sep. 30, 2021 245,305 $ 0 241,833 3,472
Balance, beginning of period, shares at Dec. 31, 2021   1,895    
Balance, beginning of period at Dec. 31, 2021 229,087 $ 0 225,861 3,226
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 16,377   16,377  
Dividends paid (2,618)   (2,618)  
Repurchases of common stock (in shares)   0    
Repurchases of common stock (86)   (86)  
Exercise of stock appreciation rights (in shares)   2    
Exercise of stock appreciation rights (1)   (1)  
Share-based compensation expense related to stock appreciation rights 259   259  
Accumulated postretirement benefit obligation adjustment 180     180
Net unrealized gain (loss) on investments (4,157)     (4,157)
Balance, end of period, shares at Sep. 30, 2022   1,897    
Balance, end of period at Sep. 30, 2022 239,041 $ 0 239,792 (751)
Balance, beginning of period, shares at Jun. 30, 2022   1,897    
Balance, beginning of period at Jun. 30, 2022 233,179 $ 0 232,759 420
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 7,913   7,913  
Dividends paid (873)   (873)  
Repurchases of common stock (in shares)   0    
Repurchases of common stock (86)   (86)  
Share-based compensation expense related to stock appreciation rights 79   79  
Accumulated postretirement benefit obligation adjustment 13     13
Net unrealized gain (loss) on investments (1,184)     (1,184)
Balance, end of period, shares at Sep. 30, 2022   1,897    
Balance, end of period at Sep. 30, 2022 $ 239,041 $ 0 $ 239,792 $ (751)