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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 year at Dec. 31, 2018 $ 175,639 $ 0 $ 174,690 $ 949
Balance, beginning of year, shares at Dec. 31, 2018   1,887    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 31,458   31,458  
Dividends (18,131)   (18,131)  
Shares of common stock repurchased and retired (in shares)   0    
Shares of common stock repurchased and retired (19)   (19)  
Exercise of stock appreciation rights (in shares)   2    
Exercise of stock appreciation rights 0   0  
Share-based compensation expense 264   264  
Accumulated postretirement benefit obligation adjustment 0      
Net unrealized gain (loss) on investments 2,151     2,151
Other 0      
Balance, end of year at Dec. 31, 2019 191,362 $ 0 188,262 3,100
Balance, end of year, shares at Dec. 31, 2019   1,889    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 39,420   39,420  
Dividends (31,716)   (31,716)  
Shares of common stock repurchased and retired (in shares)   0    
Shares of common stock repurchased and retired (6)   (6)  
Exercise of stock appreciation rights (in shares)   3    
Exercise of stock appreciation rights 1   1  
Share-based compensation expense 229   229  
Accumulated postretirement benefit obligation adjustment (112)     (112)
Net unrealized gain (loss) on investments 1,338     1,338
Other (94)   (94)  
Balance, end of year at Dec. 31, 2020 $ 200,422 $ 0 $ 196,096 $ 4,326
Balance, end of year, shares at Dec. 31, 2020   1,892