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Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Cumulative effect of change in accounting principle
Common Stock
Additional paid-in capital
Retaining Earnings
Retaining Earnings
Cumulative effect of change in accounting principle
Accumulated other comprehensive income
Balance, beginning (in shares) at Dec. 31, 2019     25,015,963        
Balance, beginning at Dec. 31, 2019 $ 910,472 $ (30) $ 25 $ 200,179 $ 697,116 $ (30) $ 13,152
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) (72,534)       (72,534)    
Shares repurchased (in shares)     (70,467)        
Shares repurchased (2,741)     (2,741)      
Stock based compensation (in shares)     70,597        
Stock based compensation 879     879      
Dividends on common stock (8,249)       (8,249)    
Change in net unrealized investment appreciation [1] 4,500           4,500
Change in liability for underfunded employee benefit plans [2] 847           847
Balance, ending (in shares) at Mar. 31, 2020     25,016,093        
Balance, ending at Mar. 31, 2020 $ 833,144   $ 25 198,317 616,303   18,499
Balance, beginning (in shares) at Dec. 31, 2020 25,055,479   25,055,479        
Balance, beginning at Dec. 31, 2020 $ 825,149   $ 25 202,359 555,854   66,911
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 18,702       18,702    
Shares repurchased (in shares)     (207)        
Shares repurchased (7)     (7)      
Stock based compensation (in shares)     64,583        
Stock based compensation 522     522      
Dividends on common stock (3,767)       (3,767)    
Change in net unrealized investment appreciation [1] (23,456)           (23,456)
Change in liability for underfunded employee benefit plans [2] $ 6,456           6,456
Balance, ending (in shares) at Mar. 31, 2021 25,119,855   25,119,855        
Balance, ending at Mar. 31, 2021 $ 823,599   $ 25 $ 202,874 $ 570,789   $ 49,911
[1] The change in net unrealized appreciation is net of reclassification adjustments and income taxes.
[2] The change in liability for underfunded employee benefit plans is net of reclassification adjustments and income taxes.