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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, 2019   1,889    
Balance, beginning of period at Dec. 31, 2019 $ 191,362 $ 0 $ 188,262 $ 3,100
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 22,785   22,785  
Dividends paid (2,497)   (2,497)  
Exercise of stock appreciation rights (1)   (1)  
Stock options and stock appreciation rights exercised (in shares)   3    
Share-based compensation expense related to stock appreciation rights 192   192  
Accumulated postretirement benefit obligation adjustment (32)     (32)
Net unrealized gain (loss) on investments 1,212     1,212
Other (94)   (94)  
Balance, end of period, shares at Sep. 30, 2020   1,892    
Balance, end of period at Sep. 30, 2020 $ 212,927 $ 0 208,647 4,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Dividends, Per Share, Cash Paid $ 1.32      
Balance, beginning of period, shares at Jun. 30, 2020   1,892    
Balance, beginning of period at Jun. 30, 2020 $ 198,465 $ 0 194,235 4,230
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 15,301   15,301  
Dividends paid (833)   (833)  
Exercise of stock appreciation rights 0   0  
Stock options and stock appreciation rights exercised (in shares)   0    
Share-based compensation expense related to stock appreciation rights 38   38  
Net unrealized gain (loss) on investments 50     50
Other (94)   (94)  
Balance, end of period, shares at Sep. 30, 2020   1,892    
Balance, end of period at Sep. 30, 2020 $ 212,927 $ 0 208,647 4,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.44      
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 (1)   (1)  
Stock options and stock appreciation rights exercised (in shares)   2    
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)
Other 0      
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Dividends, Per Share, Cash Paid $ 1.36      
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.46