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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 |  |  |  |  |  |  |

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