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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock Issued | Common Stock in Treasury | Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2018 |  | 23,933 | (10,116) |  |  |
Balance at Dec. 31, 2018 | $ 262,960 | $ 239 | $ (275,889) | $ 276,103 | $ (20,281) | $ 282,788
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 3,630 |  |  |  |  | 3,630
Currency translation adjustment | (2,500) |  |  |  | (2,500) |
Change in foreign currency translation due to sale of Argentina subsidiary | 0 |  |  |  |  |
Shares issued for employee benefit plan and compensation (in shares) |  | 133 |  |  |  |
Shares issued for employee benefit plan and compensation | $ 947 | $ 2 |  | 945 |  |
Purchase of treasury shares (in shares) | (58) |  | (58) |  |  |
Purchase of treasury shares | $ (1,928) |  | $ (1,928) |  |  |
Stock options exercised (in shares) | 22 | 22 |  |  |  |
Stock options exercised | $ 448 | $ 0 |  | 448 |  |
Shares Issued to directors (in shares) |  | 30 |  |  |  |
Shares issued to directors | 0 | $ 0 |  | 0 |  |
Employee and director stock-based compensation | 8,845 |  |  | 8,845 |  |
Performance-based common stock warrants | 1,997 |  |  | 1,997 |  |
Balance (in shares) at Dec. 31, 2019 |  | 24,118 | (10,174) |  |  |
Balance at Dec. 31, 2019 | 274,399 | $ 241 | $ (277,817) | 288,338 | (22,781) | 286,418
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 38,572 |  |  |  |  | 38,572
Currency translation adjustment | 4,259 |  |  |  | 4,259 |
Change in foreign currency translation due to sale of Argentina subsidiary | 0 |  |  |  |  |
Shares issued for employee benefit plan and compensation (in shares) |  | 169 |  |  |  |
Shares issued for employee benefit plan and compensation | $ 1,136 | $ 1 |  | 1,135 |  |
Purchase of treasury shares (in shares) | (444) |  | (444) |  |  |
Purchase of treasury shares | $ (17,678) |  | $ (17,678) |  |  |
Stock options exercised (in shares) | 80 | 80 |  |  |  |
Stock options exercised | $ 2,805 | $ 1 |  | 2,804 |  |
Shares Issued to directors (in shares) |  | 25 |  |  |  |
Shares issued to directors | 0 | $ 1 |  | (1) |  |
Employee and director stock-based compensation | 9,122 |  |  | 9,122 |  |
Performance-based common stock warrants | 686 |  |  | 686 |  |
Balance (in shares) at Dec. 31, 2020 |  | 24,392 | (10,618) |  |  |
Balance at Dec. 31, 2020 | 313,301 | $ 244 | $ (295,495) | 302,084 | (18,522) | 324,990
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 5,301 |  |  |  |  | 5,301
Currency translation adjustment | (427) |  |  |  | (427) |
Change in foreign currency translation due to sale of Argentina subsidiary | 5,425 |  |  |  | 5,425 |
Shares issued for employee benefit plan and compensation (in shares) |  | 203 |  |  |  |
Shares issued for employee benefit plan and compensation | $ 1,092 | $ 2 |  | 1,090 |  |
Purchase of treasury shares (in shares) | (1,243) |  | (1,243) |  |  |
Purchase of treasury shares | $ (59,664) |  | $ (59,664) |  |  |
Stock options exercised (in shares) | 54 | 54 |  |  |  |
Stock options exercised | $ 1,638 | $ 1 |  | 1,637 |  |
Shares Issued to directors (in shares) |  | 30 |  |  |  |
Shares issued to directors | 0 | $ 0 |  | 0 |  |
Employee and director stock-based compensation | 9,969 |  |  | 9,969 |  |
Performance-based common stock warrants | (686) |  |  | (686) |  |
Balance (in shares) at Dec. 31, 2021 |  | 24,679 | (11,861) |  |  |
Balance at Dec. 31, 2021 | $ 275,949 | $ 247 | $ (355,159) | $ 314,094 | $ (13,524) | $ 330,291

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