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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, 2014 | $ 191 | $ 22,985 | $ 186,745 | $ (32,970) | $ 176,951
Balance (in shares) at Dec. 31, 2014 | 16,812,794 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net exercise of stock options |  | (2,666) |  | 6,566 | 3,900
Net 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 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net exercise of stock options |  | (1,312) |  | 4,246 | 2,934
Net exercise of stock options (in shares) | 265,570 |  |  |  |
Excess tax benefit from stock-based compensation |  | 737 |  |  | 737
Stock based compensation expense |  | 1,681 |  |  | 1,681
Net income |  |  | 24,574 |  | 24,574
Balance at Dec. 31, 2016 | $ 191 | 23,834 | 231,978 | (22,158) | $ 233,845
Balance (in shares) at Dec. 31, 2016 | 17,468,269 |  |  |  | 17,468,269
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net exercise of stock options |  | 812 |  | 4,035 | $ 4,847
Net exercise of stock options (in shares) | 291,177 |  |  |  |
Stock based compensation expense |  | 2,244 |  |  | 2,244
Net income |  |  | 25,538 |  | 25,538
Balance at Dec. 31, 2017 | $ 191 | $ 26,890 | $ 257,516 | $ (18,123) | $ 266,474
Balance (in shares) at Dec. 31, 2017 | 17,759,446 |  |  |  | 17,759,446

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