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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 (Note 2) | 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 |  | 23,934 |  | 0 |  | 0 |  | 23,934 |
Net earnings | ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  | 793
Other comprehensive income, net of tax | 0 |  | 0 |  | 0 |  | (3,721) |  | 0 |  | (3,721) |
Cash dividends paid | 0 |  | 0 |  | (9,437) |  | 0 |  | 0 |  | (9,437) |
Purchase of treasury stock | 0 |  | 0 |  | 0 |  | 0 |  | (7,324) |  | (7,324) |
Stock-based compensation | 0 |  | 2,581 |  | 0 |  | 0 |  | 1,315 |  | 3,896 |
Employee Stock Ownership Plan | 0 |  | 765 |  | 0 |  | 0 |  | 1,792 |  | 2,557 |
Balance at end of period at Jun. 30, 2018 | 47,872 |  | 103,403 |  | 370,461 |  | (7,830) |  | (51,536) |  | 462,370 |
Balance at beginning of period at Mar. 31, 2018 |  |  |  |  |  |  | (1,895) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  |  | 15,945 |
Net earnings | ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  | $ 402
Other comprehensive income, net of tax |  |  |  |  |  |  |  |  |  |  | (5,935) |
Balance at end of period at Jun. 30, 2018 | $ 47,872 |  | $ 103,403 |  | $ 370,461 |  | $ (7,830) |  | $ (51,536) |  | $ 462,370 |

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