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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Common Stock | Capital in Excess of Par Value | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 3,457 |  | $ 68,127 | $ (1,980) | $ 69,604
Balance (in shares) at Dec. 31, 2017 | 34,572 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock issued for stock incentive plans, net | $ 20 | $ 496 |  |  | 516
Stock issued for stock incentive plans, net (in shares) | 194 |  |  |  |
Stock purchased and retired | $ (20) | (496) | (2,419) |  | (2,935)
Stock purchased and retired (in shares) | (200) |  |  |  |
Net income |  |  | 7,609 |  | 7,609
Pension adjustment, net of taxes |  |  |  | 19 | 19
Unrealized gain on securities, net of taxes and reclassification adjustment |  |  |  | 7 | 7
Dividends paid |  |  | (3,465) |  | (3,465)
Balance at Mar. 31, 2018 | $ 3,457 |  | 69,852 | (1,954) | 71,355
Balance (in shares) at Mar. 31, 2018 | 34,566 |  |  |  |
Balance at Dec. 31, 2017 | $ 3,457 |  | 68,127 | (1,980) | 69,604
Balance (in shares) at Dec. 31, 2017 | 34,572 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income |  |  |  |  | 23,760
Pension adjustment, net of taxes |  |  |  |  | 51
Unrealized gain on securities, net of taxes and reclassification adjustment |  |  |  |  | 16
Balance at Sep. 30, 2018 | $ 3,450 |  | 78,958 | (1,913) | 80,495
Balance (in shares) at Sep. 30, 2018 | 34,499 |  |  |  |
Balance at Mar. 31, 2018 | $ 3,457 |  | 69,852 | (1,954) | 71,355
Balance (in shares) at Mar. 31, 2018 | 34,566 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock issued for stock incentive plans, net | $ (1) | 529 |  |  | 528
Stock issued for stock incentive plans, net (in shares) | (1) |  |  |  |
Stock purchased and retired | $ (1) | (529) | 259 |  | (271)
Stock purchased and retired (in shares) | (17) |  |  |  |
Net income |  |  | 8,990 |  | 8,990
Pension adjustment, net of taxes |  |  |  | 15 | 15
Unrealized gain on securities, net of taxes and reclassification adjustment |  |  |  | 9 | 9
Dividends paid |  |  | (3,455) |  | (3,455)
Balance at Jun. 30, 2018 | $ 3,455 |  | 75,646 | (1,930) | 77,171
Balance (in shares) at Jun. 30, 2018 | 34,548 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock issued for stock incentive plans, net | $ 0 | 528 |  |  | 528
Stock issued for stock incentive plans, net (in shares) | 0 |  |  |  |
Stock purchased and retired | $ (5) | (528) | (397) |  | (930)
Stock purchased and retired (in shares) | (49) |  |  |  |
Net income |  |  | 7,161 |  | 7,161
Pension adjustment, net of taxes |  |  |  | 17 | 17
Dividends paid |  |  | (3,452) |  | (3,452)
Balance at Sep. 30, 2018 | $ 3,450 |  | 78,958 | (1,913) | 80,495
Balance (in shares) at Sep. 30, 2018 | 34,499 |  |  |  |
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 |  | 73,382 | (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) | 82,137
Balance (in shares) at Sep. 30, 2019 | 33,960 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Adoption of accounting standard (Note 2) |  |  | 414 | (414) |
Balance at Mar. 31, 2019 | $ 3,413 |  | 73,382 | (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) | 82,137
Balance (in shares) at Sep. 30, 2019 | 33,960 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Adoption of accounting standard (Note 2) |  |  |  |  | $ 414

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