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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, shares at Dec. 31, 2018   1,887    
Balance, beginning of year at Dec. 31, 2018 $ 175,639 $ 0 $ 174,690 $ 949
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) 6,626   6,626  
Dividends paid (755)   (755)  
Shares of common stock repurchased and retired (in shares)   0    
Shares of common stock repurchased and retired (11)   (11)  
Stock options and stock appreciation rights exercised (in shares)   2    
Stock options and stock appreciation rights exercised (1)   (1)  
Share-based compensation expense related to stock appreciation rights 88   88  
Accumulated postretirement benefit obligation adjustment 0      
Net unrealized gain on investments 1,143     1,143
Balance, end of year, shares at Mar. 31, 2019   1,889    
Balance, end of year at Mar. 31, 2019 182,729 $ 0 180,637 2,092
Balance, beginning of year, shares at Dec. 31, 2019   1,889    
Balance, beginning of year at Dec. 31, 2019 191,362 $ 0 188,262 3,100
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) (7,011)   (7,011)  
Dividends paid (832)   (832)  
Stock options and stock appreciation rights exercised (in shares)   2    
Stock options and stock appreciation rights exercised (1)   (1)  
Share-based compensation expense related to stock appreciation rights 117   117  
Accumulated postretirement benefit obligation adjustment (32)     (32)
Net unrealized gain on investments 44     44
Balance, end of year, shares at Mar. 31, 2020   1,891    
Balance, end of year at Mar. 31, 2020 $ 183,647 $ 0 $ 180,535 $ 3,112