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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 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 (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [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]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment | ASC 606 [Member] |  | $ 0 |  | $ 0 |  | $ (1,189) |  | $ 0 |  | $ 0 |  | $ (1,189)
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 |  | 39,683 |  | 0 |  | 0 |  | 39,683 |
Other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 |  | (3,008) |  | 0 |  | (3,008) |
Cash dividends paid | 0 |  | 0 |  | (14,144) |  | 0 |  | 0 |  | (14,144) |
Purchase of treasury stock | 0 |  | 0 |  | 0 |  | 0 |  | (9,115) |  | (9,115) |
Stock-based compensation | 0 |  | 4,054 |  | 0 |  | 0 |  |  |  | 5,614 |
Stock-based compensation |  |  |  |  |  |  |  |  | 1,560 |  |  |
Employee stock ownership plan | 0 |  | 765 |  | 0 |  | 0 |  |  |  | 2,557 |
Employee stock ownership plan |  |  |  |  |  |  |  |  | 1,792 |  |  |
Balance at end of period at Sep. 30, 2018 | 47,872 |  | 104,876 |  | 381,503 |  | (7,117) |  | (53,082) |  | 474,052 |
Balance at beginning of period at Jun. 30, 2018 | 47,872 |  | 103,403 |  | 370,461 |  | (7,830) |  | (51,536) |  | 462,370 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 0 |  | 0 |  | 15,749 |  | 0 |  | 0 |  | 15,749 |
Other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 |  | 713 |  | 0 |  | 713 |
Cash dividends paid | 0 |  | 0 |  | (4,707) |  | 0 |  | 0 |  | (4,707) |
Purchase of treasury stock | 0 |  | 0 |  | 0 |  | 0 |  | (1,791) |  | (1,791) |
Stock-based compensation | 0 |  | 1,473 |  | 0 |  | 0 |  |  |  | 1,718 |
Stock-based compensation |  |  |  |  |  |  |  |  | 245 |  |  |
Balance at end of period at Sep. 30, 2018 | 47,872 |  | 104,876 |  | 381,503 |  | (7,117) |  | (53,082) |  | 474,052 |
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] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 0 |  | 0 |  | 46,399 |  | 0 |  | 0 |  | 46,399 |
Other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 |  | (1,642) |  | 0 |  | (1,642) |
Cash dividends paid | 0 |  | 0 |  | (15,429) |  | 0 |  | 0 |  | (15,429) |
Purchase of treasury stock | 0 |  | 0 |  | 0 |  | 0 |  | (10,738) |  | (10,738) |
Stock-based compensation | 0 |  | 2,828 |  | 0 |  | 0 |  |  |  | 5,742 |
Stock-based compensation |  |  |  |  |  |  |  |  | 2,914 |  |  |
Employee stock ownership plan | 0 |  | 745 |  | 0 |  | 0 |  |  |  | 2,519 |
Employee stock ownership plan |  |  |  |  |  |  |  |  | 1,774 |  |  |
Balance at end of period at Sep. 30, 2019 | 47,872 |  | 106,043 |  | 411,083 |  | (11,236) |  | (59,710) |  | 494,052 |
Balance at beginning of period at Jun. 30, 2019 | 47,872 |  | 105,347 |  | 401,465 |  | (8,511) |  | (60,908) |  | 485,265 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 0 |  | 0 |  | 14,751 |  | 0 |  | 0 |  | 14,751 |
Other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 |  | (2,725) |  | 0 |  | (2,725) |
Cash dividends paid | 0 |  | 0 |  | (5,133) |  | 0 |  | 0 |  | (5,133) |
Stock-based compensation | 0 |  | 696 |  | 0 |  | 0 |  |  |  | 1,894 |
Stock-based compensation |  |  |  |  |  |  |  |  | 1,198 |  |  |
Balance at end of period at Sep. 30, 2019 | $ 47,872 |  | $ 106,043 |  | $ 411,083 |  | $ (11,236) |  | $ (59,710) |  | $ 494,052 |

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