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Interim Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 9 months ended Sep. 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 | 56,897 |  |  |  |  |
Translation adjustment | (9,657) |  |  |  |  | (9,657)
Net actuarial gain arising during period, net of taxes | 501 |  |  |  |  | 501
Stock-based compensation | 1,810 |  | 1,810 |  |  |
Exercise of stock options (shares) |  | 84 |  |  |  |
Exercise of stock options | 2,071 | $ 8 | 2,063 |  |  |
Dividends paid ($0.22 per share) | (3,838) |  |  |  | (3,838) |
Balance (shares) at Sep. 30, 2018 |  | 11,618 |  |  |  |
Balance at Sep. 30, 2018 | $ 496,892 | $ 1,166 | $ 107,737 | $ (426) | $ 427,737 | $ (39,322)

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