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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Common Stock [Member] Adjustments Due to Adoption of ASU 2014-09 [Member] | Capital In Excess of Par Value [Member] | Capital In Excess of Par Value [Member] Adjustments Due to Adoption of ASU 2014-09 [Member] | Retained Earnings [Member] | Retained Earnings [Member] Adjustments Due to Adoption of ASU 2014-09 [Member] | Accumulated Other Comprehensive Income [Member] | Accumulated Other Comprehensive Income [Member] Adjustments Due to Adoption of ASU 2014-09 [Member] | Treasury Stock [Member] | Treasury Stock [Member] Adjustments Due to Adoption of ASU 2014-09 [Member] | Total | Adjustments Due to Adoption of ASU 2014-09 [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2016 | $ 47,872 |  | $ 96,850 |  | $ 336,464 |  | $ (11,028) |  | $ (29,130) |  | $ 441,028 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 0 |  | 0 |  | 37,976 |  | 0 |  | 0 |  | 37,976 |
Other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 |  | 6,919 |  | 0 |  | 6,919 |
Cash dividends paid | 0 |  | 0 |  | (17,287) |  | 0 |  | 0 |  | (17,287) |
Purchase of treasury stock | 0 |  | 0 |  | 0 |  | 0 |  | (24,779) |  | (24,779) |
Stock-based compensation | 0 |  | 2,193 |  | 0 |  | 0 |  | 5,445 |  | 7,638 |
Employee stock ownership plan | 0 |  | 1,014 |  | 0 |  | 0 |  |  |  | 2,159 |
Employee stock ownership plan |  |  |  |  |  |  |  |  | 1,145 |  |  |
Balance at beginning of period at Dec. 31, 2017 | 47,872 |  | 100,057 |  | 357,153 |  | (4,109) |  | (47,319) |  | 453,654 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 0 |  | 0 |  | 43,003 |  | 0 |  | 0 |  | 43,003 |
Other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 |  | (5,485) |  | 0 |  | (5,485) |
Cash dividends paid | 0 |  | 0 |  | (18,854) |  | 0 |  | 0 |  | (18,854) |
Purchase of treasury stock | 0 |  | 0 |  | 0 |  | 0 |  | (14,483) |  | (14,483) |
Stock-based compensation | 0 |  | 1,648 |  | 0 |  | 0 |  | 6,350 |  | 7,998 |
Employee stock ownership plan | 0 |  | 765 |  | 0 |  | 0 |  |  |  | 2,557 |
Employee stock ownership plan |  |  |  |  |  |  |  |  | 1,792 |  |  |
Balance at beginning of period at Dec. 31, 2018 | 47,872 |  | 102,470 |  | 380,113 |  | (9,594) |  | (53,660) |  | 467,201 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment | ASC 606 [Member] |  | $ 0 |  | $ 0 |  | $ (1,189) |  | $ 0 |  | $ 0 |  | $ (1,189)
Net earnings | 0 |  | 0 |  | 57,917 |  | 0 |  | 0 |  | 57,917 |
Other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 |  | 1,005 |  | 0 |  | 1,005 |
Cash dividends paid | 0 |  | 0 |  | (20,593) |  | 0 |  | 0 |  | (20,593) |
Purchase of treasury stock | 0 |  | 0 |  | 0 |  | 0 |  | (10,738) |  | (10,738) |
Stock-based compensation | 0 |  | (473) |  | 0 |  | 0 |  | 7,390 |  | 6,917 |
Employee stock ownership plan | 0 |  | 745 |  | 0 |  | 0 |  |  |  | 2,519 |
Employee stock ownership plan |  |  |  |  |  |  |  |  | 1,774 |  |  |
Balance at beginning of period at Dec. 31, 2019 | $ 47,872 |  | $ 102,742 |  | $ 417,437 |  | $ (8,589) |  | $ (55,234) |  | $ 504,228 |

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