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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 236,919 | $ 1,179 | $ 82,721 | $ (426) | $ 148,298 | $ 5,147
Balance (shares) at Dec. 31, 2009 |  | 11,747,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 21,117 |  |  |  | 21,117 |
Translation adjustment | (3,727) |  |  |  |  | (3,727)
Unrealized derivative gain, net of taxes | 641 |  |  |  |  | 641
Net actuarial (loss) arising during period net of taxes | (528) |  |  |  |  | (528)
Stock-based compensation | 674 |  | 674 |  |  |
Issuance of stock for acquisition | 0 | 0 | 0 |  |  |
Issuance of stock for acquisition, shares |  | 0 |  |  |  |
Exercise of stock options | 990 | 8 | 982 |  |  |
Exercise of stock options, shares |  | 83,000 |  |  |  |
Dividends paid | (2,826) |  |  |  | (2,826) |
Balance at Dec. 31, 2010 | 253,260 | 1,187 | 84,377 | (426) | 166,589 | 1,533
Balance (shares) at Dec. 31, 2010 |  | 11,830,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 32,687 |  |  |  | 32,687 |
Translation adjustment | (2,788) |  |  |  |  | (2,788)
Unrealized derivative gain, net of taxes | 144 |  |  |  |  | 144
Net actuarial (loss) arising during period net of taxes | (4,512) |  |  |  |  | (4,512)
Tax effect of non-qualified stock options | 63 |  | 63 |  |  |
Stock-based compensation | 986 |  | 986 |  |  |
Exercise of stock options | 281 | 3 | 278 |  |  |
Exercise of stock options, shares |  | 30,000 |  |  |  |
Dividends paid | (2,845) |  |  |  | (2,845) |
Balance at Dec. 31, 2011 | 277,276 | 1,190 | 85,704 | (426) | 196,431 | (5,623)
Balance (shares) at Dec. 31, 2011 |  | 11,860,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 28,903 |  |  |  | 28,903 |
Translation adjustment | 4,445 |  |  |  |  | 4,445
Unrealized derivative gain, net of taxes | 0 |  |  |  |  |
Net actuarial (loss) arising during period net of taxes | (453) |  |  |  |  | (453)
Tax effect of non-qualified stock options | (102) |  | (102) |  |  |
Stock-based compensation | 940 |  | 940 |  |  |
Exercise of stock options | 2,131 | 13 | 2,118 |  |  |
Exercise of stock options, shares |  | 126,000 |  |  |  |
Dividends paid | (2,854) |  |  |  | (2,854) |
Balance at Dec. 31, 2012 | $ 310,286 | $ 1,203 | $ 88,660 | $ (426) | $ 222,480 | $ (1,631)
Balance (shares) at Dec. 31, 2012 |  | 11,986,000 |  |  |  |

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