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Consolidated Statements of Stockholders Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 263,429 | $ 1,481 | $ 54,357 | $ (19,881) | $ 226,285 | $ 1,187
Balance, Shares at Dec. 31, 2009 |  | 14,239,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Treasury Stock, Shares |  | (821,000) |  |  |  |
Treasury Stock, Value | (28,648) | 0 | 0 | (28,648) |  |
Exercise of stock options, shares issued |  | 188,000 |  |  |  |
Exercise of stock options, value | 4,204 | 3 | (1,622) | 5,823 |  |
Employee stock purchase plan, shares issued |  | 53,000 |  |  |  |
Employee stock purchase plan, value | 1,576 | 2 | 296 | 1,278 |  |
Stock compensation | 3,471 |  | 3,471 |  |  |
Foreign Currency Translation Adjustment | (2,251) |  |  |  |  | (2,251)
Net Income | 29,923 |  |  |  | 29,923 |
Balance at Dec. 31, 2010 | 271,704 | 1,486 | 56,502 | (41,428) | 256,208 | (1,064)
Balance, Shares at Dec. 31, 2010 |  | 13,659,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Treasury Stock, Shares |  | (305,000) |  |  |  |
Treasury Stock, Value | (11,956) |  |  | (11,956) |  |
Exercise of stock options, shares issued |  | 459,000 |  |  |  |
Exercise of stock options, value | 12,262 | 0 | (3,753) | 16,015 |  |
Employee stock purchase plan, shares issued |  | 58,000 |  |  |  |
Employee stock purchase plan, value | 1,828 | 0 | (193) | 2,021 |  |
Stock compensation | 4,016 |  | 4,016 |  |  |
Research and development tax credit from stock options | 224 |  | 224 |  |  |
Foreign Currency Translation Adjustment | (2,170) |  |  |  |  | (2,170)
Net Income | 44,669 |  |  |  | 44,669 |
Balance at Dec. 31, 2011 | 320,577 | 1,486 | 56,796 | (35,348) | 300,877 | (3,234)
Balance, Shares at Dec. 31, 2011 | 13,871,000 | 13,871,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, shares issued |  | 526,000 |  |  |  |
Exercise of stock options, value | 19,411 | 0 | 1,348 | 18,063 |  |
Employee stock purchase plan, shares issued |  | 61,000 |  |  |  |
Employee stock purchase plan, value | 2,220 |  | 63 | 2,157 |  |
Stock compensation | 5,563 |  | 5,563 |  |  |
Foreign Currency Translation Adjustment | 1,805 |  |  |  |  | 1,805
Net Income | 41,281 |  |  |  | 41,281 |
Balance at Dec. 31, 2012 | $ 390,857 | $ 1,486 | $ 63,770 | $ (15,128) | $ 342,158 | $ (1,429)
Balance, Shares at Dec. 31, 2012 | 14,458,000 | 14,458,000 |  |  |  |

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