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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Retained Earnings | Treasury Stock | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 191 | $ 34,364 | $ 154,599 | $ (48,306) | $ 140,848
Balance (in shares) at Dec. 31, 2012 | 16,147,324 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Exercise of stock options |  | (5,071) |  | 8,509 | 3,438
Exercise of stock options (in shares) | 335,444 |  |  |  |
Excess tax benefit from stock-based compensation |  | 413 |  |  | 413
Stock based compensation expense |  | 1,220 |  |  | 1,220
Net income |  |  | 17,961 |  | 17,961
Balance at Dec. 31, 2013 | $ 191 | 30,926 | 172,560 | (39,797) | 163,880
Balance (in shares) at Dec. 31, 2013 | 16,482,768 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Exercise of stock options |  | (9,553) |  | 6,827 | (2,726)
Exercise of stock options (in shares) | 330,026 |  |  |  |
Excess tax benefit from stock-based compensation |  | 386 |  |  | 386
Stock based compensation expense |  | 1,226 |  |  | 1,226
Net income |  |  | 14,185 |  | 14,185
Balance at Dec. 31, 2014 | $ 191 | 22,985 | 186,745 | (32,970) | $ 176,951
Balance (in shares) at Dec. 31, 2014 | 16,812,794 |  |  |  | 16,812,794
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Exercise of stock options |  | (2,666) |  | 6,566 | $ 3,900
Exercise of stock options (in shares) | 389,905 |  |  |  |
Excess tax benefit from stock-based compensation |  | 865 |  |  | 865
Stock based compensation expense |  | 1,544 |  |  | 1,544
Net income |  |  | 20,659 |  | 20,659
Balance at Dec. 31, 2015 | $ 191 | $ 22,728 | $ 207,404 | $ (26,404) | $ 203,919
Balance (in shares) at Dec. 31, 2015 | 17,202,699 |  |  |  | 17,202,699

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