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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Common Stock | Treasury Stock | Additional Paid-in Capital
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 616,881 | $ 464,639 | $ (1,642) | $ 2,135 | $ 0 | $ 151,749
Beginning balance (in shares) at Dec. 31, 2017 |  |  |  | 32,019,605 | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net earnings | 78,573 | 78,573 |  |  |  | 0
Other comprehensive loss | (1,960) | 0 | (1,960) |  |  | 0
Dividends | (15,185) | (15,185) |  |  |  | 0
Treasury shares purchased | (1,394) |  |  |  | $ (1,394) | 0
Treasury shares purchased (in shares) |  |  |  |  | (16,755) |
Shares and options issued under stock plans | 14,703 |  |  | $ 16 | $ 1,338 | 13,349
Shares and options issued under stock plans (in shares) |  |  |  | 237,310 | 16,049 |
Ending balance at Dec. 31, 2018 | 691,618 | 528,027 | (3,602) | $ 2,151 | $ (56) | 165,098
Ending balance (in shares) at Dec. 31, 2018 |  |  |  | 32,256,915 | (706) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net earnings | 79,671 | 79,671 |  |  |  | 0
Other comprehensive loss | (1,962) |  | (1,962) |  |  | 0
Dividends | (16,777) | (16,777) |  |  |  | 0
Treasury shares purchased | (21,321) |  |  |  | $ (21,321) | 0
Treasury shares purchased (in shares) |  |  |  |  | (240,995) |
Shares and options issued under stock plans | 12,438 |  |  | $ 10 | $ 3,308 | 9,120
Shares and options issued under stock plans (in shares) |  |  |  | 148,881 | 37,822 |
Ending balance at Dec. 31, 2019 | 743,667 | 590,921 | (5,564) | $ 2,161 | $ (18,069) | 174,218
Ending balance (in shares) at Dec. 31, 2019 |  |  |  | 32,405,796 | (203,879) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net earnings | 84,623 | 84,623 |  |  |  | 0
Other comprehensive loss | 9,737 |  | 9,737 |  |  | 0
Dividends | (18,804) | (18,804) |  |  |  | 0
Treasury shares purchased | (13,463) |  |  |  | $ (13,463) | 0
Treasury shares purchased (in shares) |  |  |  |  | (136,629) |
Shares and options issued under stock plans | 22,473 |  |  | $ 3 | $ 23,659 | (1,189)
Shares and options issued under stock plans (in shares) |  |  |  | 42,909 | 264,424 |
Ending balance at Dec. 31, 2020 | $ 828,233 | $ 656,740 | $ 4,173 | $ 2,164 | $ (7,873) | $ 173,029
Ending balance (in shares) at Dec. 31, 2020 |  |  |  | 32,448,705 | (76,084) |

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