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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Capital in Excess of Par Value
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect, Period of Adoption, Adjustment
Total
Balance at Dec. 31, 2018 $ 3,433     $ 73,954   $ (2,175)   $ 75,212
Balance (in shares) at Dec. 31, 2018 34,328              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock issued for stock incentive plans, net $ 14 $ 524           538
Stock issued for stock incentive plans, net (in shares) 141              
Stock purchased and retired $ (34) (524)   (4,338)       (4,896)
Stock purchased and retired (in shares) (344)              
Net income       7,469       7,469
Pension adjustment, net of taxes           17   17
Unrealized gain on securities, net of taxes and reclassification adjustment           7   7
Dividends paid       (4,117)       (4,117)
Balance at Mar. 31, 2019 $ 3,413   $ 414 73,382 $ (414) (2,565)   74,230
Balance (in shares) at Mar. 31, 2019 34,125              
Balance at Dec. 31, 2018 $ 3,433     73,954   (2,175)   75,212
Balance (in shares) at Dec. 31, 2018 34,328              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income               24,697
Pension adjustment, net of taxes               50
Unrealized gain on securities, net of taxes and reclassification adjustment               7
Balance at Sep. 30, 2019 $ 3,396     81,273   (2,532) $ 414 82,137
Balance (in shares) at Sep. 30, 2019 33,960              
Balance at Mar. 31, 2019 $ 3,413   $ 414 73,382 $ (414) (2,565)   74,230
Balance (in shares) at Mar. 31, 2019 34,125              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock issued for stock incentive plans, net $ (1) 545           544
Stock issued for stock incentive plans, net (in shares) (11)              
Stock purchased and retired $ (8) (545)   (443)       (996)
Stock purchased and retired (in shares) (69)              
Net income       9,373       9,373
Pension adjustment, net of taxes           17   17
Dividends paid       (4,092)       (4,092)
Balance at Jun. 30, 2019 $ 3,404     78,220   (2,548)   79,076
Balance (in shares) at Jun. 30, 2019 34,045              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock issued for stock incentive plans, net   544           544
Stock purchased and retired $ (8) (544)   (719)       (1,271)
Stock purchased and retired (in shares) (85)              
Net income       7,855       7,855
Pension adjustment, net of taxes           16   16
Dividends paid       (4,083)       (4,083)
Balance at Sep. 30, 2019 $ 3,396     81,273   (2,532) $ 414 82,137
Balance (in shares) at Sep. 30, 2019 33,960              
Balance at Dec. 31, 2019 $ 3,387     76,573   (2,748)   77,212
Balance (in shares) at Dec. 31, 2019 33,870              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock issued for stock incentive plans, net $ 18 558           576
Stock issued for stock incentive plans, net (in shares) 175              
Stock purchased and retired $ (8) (558)   (489)       (1,055)
Stock purchased and retired (in shares) (73)              
Net income       4,208       4,208
Pension adjustment, net of taxes           119   119
Dividends paid       (4,074)       (4,074)
Balance at Mar. 31, 2020 $ 3,397     76,218   (2,629)   76,986
Balance (in shares) at Mar. 31, 2020 33,972              
Balance at Dec. 31, 2019 $ 3,387     76,573   (2,748)   77,212
Balance (in shares) at Dec. 31, 2019 33,870              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income               12,450
Pension adjustment, net of taxes               157
Balance at Sep. 30, 2020 $ 3,387     79,679   (2,591)   80,475
Balance (in shares) at Sep. 30, 2020 33,869              
Balance at Mar. 31, 2020 $ 3,397     76,218   (2,629)   76,986
Balance (in shares) at Mar. 31, 2020 33,972              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock issued for stock incentive plans, net   581           581
Stock purchased and retired   (581)   552       (29)
Stock purchased and retired (in shares) (3)              
Net income       1,707       1,707
Pension adjustment, net of taxes           19   19
Dividends paid       (2,696)       (2,696)
Balance at Jun. 30, 2020 $ 3,397     75,781   (2,610)   76,568
Balance (in shares) at Jun. 30, 2020 33,969              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock issued for stock incentive plans, net $ (1) 1,501           1,500
Stock issued for stock incentive plans, net (in shares) (2)              
Stock purchased and retired $ (9) $ (1,501)   79       (1,431)
Stock purchased and retired (in shares) (98)              
Net income       6,535       6,535
Pension adjustment, net of taxes           19   19
Dividends paid       (2,716)       (2,716)
Balance at Sep. 30, 2020 $ 3,387     $ 79,679   $ (2,591)   $ 80,475
Balance (in shares) at Sep. 30, 2020 33,869