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Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive income (loss), net of tax
Balance, beginning of year at Dec. 31, 2017 $ 973,373 $ 25 $ 196,334 $ 608,700 $ 168,314
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation expense and related tax benefit for stock-based award grants     1,281    
Shares repurchased   0 (5,404)    
Shares issued for stock-based awards   0 2,293    
Change in net unrealized investment appreciation and depreciation of discontinued operations, sold       (6,714) (34,248) [1]
Net income 45,759     45,759  
Dividends on common stock ($0.31 per share in 2019 and $0.28 per share in 2018)       (6,958)  
Change in liability for underfunded employee benefit plans [2]         1,311
All other changes in stockholders’ equity accounts (48,439)        
Balance, end of period at Mar. 31, 2018 970,693 25 194,504 832,031 (55,867)
Balance, beginning of year at Dec. 31, 2018 888,375 25 203,350 715,472 (30,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation expense and related tax benefit for stock-based award grants     2,688    
Shares repurchased   0 0    
Shares issued for stock-based awards   0 750    
Change in net unrealized investment appreciation and depreciation of discontinued operations, sold       0 26,279 [1]
Net income 44,521     44,521  
Dividends on common stock ($0.31 per share in 2019 and $0.28 per share in 2018)       (7,797)  
Change in liability for underfunded employee benefit plans [2]         888
All other changes in stockholders’ equity accounts 22,295        
Balance, end of period at Mar. 31, 2019 $ 955,191 $ 25 $ 206,788 $ 751,683 $ (3,305)
[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.