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Interim Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Beginning balance ( in shares) at Dec. 31, 2017 |  | 11,534 |  |  |  |
Beginning 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 | 14,583 |  |  |  | 14,583 |
Translation adjustment | 3,117 |  |  |  |  | 3,117
Net actuarial gain arising during period, net of taxes | 126 |  |  |  |  | 126
Stock-based compensation | 458 |  | 458 |  |  |
Exercise of stock options (in shares) |  | 9 |  |  |  |
Exercise of stock options | 266 |  | 266 |  |  |
Dividends paid | (1,276) |  |  |  | (1,276) |
Ending balance (in shares) at Mar. 31, 2018 |  | 11,543 |  |  |  |
Ending balance at Mar. 31, 2018 | 466,382 | $ 1,158 | 104,588 | (426) | 387,985 | (26,923)
Beginning balance ( in shares) at Dec. 31, 2017 |  | 11,534 |  |  |  |
Beginning 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 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2018 |  | 11,618 |  |  |  |
Ending balance at Sep. 30, 2018 | 496,892 | $ 1,166 | 107,737 | (426) | 427,737 | (39,322)
Beginning balance ( in shares) at Mar. 31, 2018 |  | 11,543 |  |  |  |
Beginning balance at Mar. 31, 2018 | 466,382 | $ 1,158 | 104,588 | (426) | 387,985 | (26,923)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 18,771 |  |  |  | 18,771 |
Translation adjustment | (11,850) |  |  |  |  | (11,850)
Net actuarial gain arising during period, net of taxes | 208 |  |  |  |  | 208
Stock-based compensation | 730 |  | 730 |  |  |
Common stock repurchase | (437) |  | (437) |  |  |
Exercise of stock options (in shares) |  | 67 |  |  |  |
Exercise of stock options | 1,920 | $ 7 | 1,913 |  |  |
Dividends paid | (1,277) |  |  |  | (1,277) |
Ending balance (in shares) at Jun. 30, 2018 |  | 11,610 |  |  |  |
Ending balance at Jun. 30, 2018 | 474,447 | $ 1,165 | 106,794 | (426) | 405,479 | (38,565)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 23,543 |  |  |  | 23,543 |
Translation adjustment | (924) |  |  |  |  | (924)
Net actuarial gain arising during period, net of taxes | 167 |  |  |  |  | 167
Stock-based compensation | 622 |  | 622 |  |  |
Common stock repurchase | 1 |  | 1 |  |  |
Exercise of stock options (in shares) |  | 8 |  |  |  |
Exercise of stock options | 321 | $ 1 | 320 |  |  |
Dividends paid | (1,285) |  |  |  | (1,285) |
Ending balance (in shares) at Sep. 30, 2018 |  | 11,618 |  |  |  |
Ending balance at Sep. 30, 2018 | 496,892 | $ 1,166 | 107,737 | (426) | 427,737 | (39,322)
Beginning balance ( in shares) at Dec. 31, 2018 |  | 11,620 |  |  |  |
Beginning balance at Dec. 31, 2018 | 507,371 | $ 1,166 | 108,422 | (426) | 443,040 | (44,831)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 15,253 |  |  |  | 15,253 |
Translation adjustment | 720 |  |  |  |  | 720
Net actuarial gain arising during period, net of taxes | 170 |  |  |  |  | 170
Stock-based compensation | 627 |  | 627 |  |  |
Common stock repurchase (in shares) |  | (15) |  |  |  |
Common stock repurchase | (1,490) |  |  | (1,490) |  |
Exercise of stock options (in shares) |  | 11 |  |  |  |
Exercise of stock options | 237 | $ 1 | 236 |  |  |
Dividends paid | (1,404) |  |  |  | (1,404) |
Ending balance (in shares) at Mar. 31, 2019 |  | 11,616 |  |  |  |
Ending balance at Mar. 31, 2019 | 521,484 | $ 1,167 | 109,285 | (1,916) | 456,889 | (43,941)
Beginning balance ( in shares) at Dec. 31, 2018 |  | 11,620 |  |  |  |
Beginning balance at Dec. 31, 2018 | 507,371 | $ 1,166 | 108,422 | (426) | 443,040 | (44,831)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 53,338 |  |  |  | 53,338 |
Ending balance (in shares) at Sep. 30, 2019 |  | 11,665 |  |  |  |
Ending balance at Sep. 30, 2019 | 551,052 | $ 1,175 | 112,629 | (4,566) | 492,161 | (50,347)
Beginning balance ( in shares) at Mar. 31, 2019 |  | 11,616 |  |  |  |
Beginning balance at Mar. 31, 2019 | 521,484 | $ 1,167 | 109,285 | (1,916) | 456,889 | (43,941)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 20,667 |  |  |  | 20,667 |
Translation adjustment | 1,194 |  |  |  |  | 1,194
Unrealized derivative gain (loss), net of taxes | (12) |  |  |  |  | (12)
Net actuarial gain arising during period, net of taxes | 170 |  |  |  |  | 170
Stock-based compensation | 948 |  | 948 |  |  |
Common stock repurchase (in shares) |  | (15) |  |  |  |
Common stock repurchase | (2,055) |  | (590) | (1,465) |  |
Exercise of stock options (in shares) |  | 64 |  |  |  |
Exercise of stock options | 1,840 | $ 7 | 1,833 |  |  |
Dividends paid | (1,404) |  |  |  | (1,404) |
Ending balance (in shares) at Jun. 30, 2019 |  | 11,665 |  |  |  |
Ending balance at Jun. 30, 2019 | 542,832 | $ 1,174 | 111,476 | (3,381) | 476,152 | (42,589)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 17,418 |  |  |  | 17,418 |
Translation adjustment | (9,791) |  |  |  |  | (9,791)
Unrealized derivative gain (loss), net of taxes | 1,864 |  |  |  |  | 1,864
Net actuarial gain arising during period, net of taxes | 169 |  |  |  |  | 169
Stock-based compensation | 766 |  | 766 |  |  |
Common stock repurchase (in shares) |  | (10) |  |  |  |
Common stock repurchase | (1,185) |  |  | (1,185) |  |
Exercise of stock options (in shares) |  | 10 |  |  |  |
Exercise of stock options | 388 | $ 1 | 387 |  |  |
Dividends paid | (1,409) |  |  |  | (1,409) |
Ending balance (in shares) at Sep. 30, 2019 |  | 11,665 |  |  |  |
Ending balance at Sep. 30, 2019 | $ 551,052 | $ 1,175 | $ 112,629 | $ (4,566) | $ 492,161 | $ (50,347)

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