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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, 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 (loss) 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
Balance, beginning of year, shares at Dec. 31, 2020   1,892    
Balance, beginning of year at Dec. 31, 2020 200,422 $ 0 196,096 4,326
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) 13,823   13,823  
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 71   71  
Accumulated postretirement benefit obligation adjustment 0      
Net unrealized gain (loss) on investments (610)     (610)
Balance, end of year, shares at Mar. 31, 2021   1,894    
Balance, end of year at Mar. 31, 2021 $ 212,873 $ 0 $ 209,157 $ 3,716