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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 33,605   33,605  
Dividends paid (1,705)   (1,705)  
Stock options and stock appreciation rights exercised (in shares)   2    
Exercise of stock appreciation rights (1)   (1)  
Share-based compensation expense related to stock appreciation rights 138   138  
Accumulated postretirement benefit obligation adjustment 0      
Net unrealized gain (loss) on investments (521)     (521)
Balance, end of period, shares at Jun. 30, 2021   1,894    
Balance, end of period at Jun. 30, 2021 231,938 $ 0 228,133 3,805
Balance, beginning of period, shares at Mar. 31, 2021   1,894    
Balance, beginning of period at Mar. 31, 2021 212,873 $ 0 209,157 3,716
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 19,782   19,782  
Dividends paid (873)   (873)  
Share-based compensation expense related to stock appreciation rights 67   67  
Net unrealized gain (loss) on investments 89     89
Balance, end of period, shares at Jun. 30, 2021   1,894    
Balance, end of period at Jun. 30, 2021 231,938 $ 0 228,133 3,805
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 8,464   8,464  
Dividends paid (1,745)   (1,745)  
Stock options and stock appreciation rights exercised (in shares)   2    
Exercise of stock appreciation rights (1)   (1)  
Share-based compensation expense related to stock appreciation rights 180   180  
Accumulated postretirement benefit obligation adjustment 167     167
Net unrealized gain (loss) on investments (2,973)     (2,973)
Balance, end of period, shares at Jun. 30, 2022   1,897    
Balance, end of period at Jun. 30, 2022 233,179 $ 0 232,759 420
Balance, beginning of period, shares at Mar. 31, 2022   1,897    
Balance, beginning of period at Mar. 31, 2022 232,492 $ 0 231,274 1,218
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 2,279   2,279  
Dividends paid (872)   (872)  
Share-based compensation expense related to stock appreciation rights 78   78  
Accumulated postretirement benefit obligation adjustment (6)     (6)
Net unrealized gain (loss) on investments (792)     (792)
Balance, end of period, shares at Jun. 30, 2022   1,897    
Balance, end of period at Jun. 30, 2022 $ 233,179 $ 0 $ 232,759 $ 420