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Interim Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Balance (shares) at Dec. 31, 2017 |  | 11,534 |  |  |  |
Balance at Dec. 31, 2017 | $ 449,108 | $ 1,158 | $ 103,864 | $ (426) | $ 374,678 | $ (30,166)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 33,354 |  |  |  | 33,354 |
Translation adjustment | (8,733) |  |  |  |  | (8,733)
Net actuarial gain arising during period, net of taxes | 334 |  |  |  |  | 334
Stock-based compensation | 1,188 |  | 1,188 |  |  |
Exercise of stock options (shares) |  | 76 |  |  |  |
Exercise of stock options | 1,749 | $ 7 | 1,742 |  |  |
Dividends paid ($0.22 per share) | (2,553) |  |  |  | (2,553) |
Balance (shares) at Jun. 30, 2018 |  | 11,610 |  |  |  |
Balance at Jun. 30, 2018 | $ 474,447 | $ 1,165 | $ 106,794 | $ (426) | $ 405,479 | $ (38,565)

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