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Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Net Income Per Share |  |  |  |
Net income | $ 6,052 | $ 7,286 | $ 10,916 | $ 14,514
Basic weighted average shares outstanding | 15,896 | 15,605 | 15,860 | 15,591
Basic net income per common share (in dollars per share) | $ 0.38 | $ 0.47 | $ 0.69 | $ 0.93
Diluted Shares Outstanding |  |  |  |
Basic weighted average shares outstanding | 15,896 | 15,605 | 15,860 | 15,591
Weighted average stock options outstanding (in shares) | 216 | 259 | 219 | 362
Diluted weighted average shares outstanding | 16,112 | 15,864 | 16,079 | 15,953
Diluted net income per common share (in dollars per share) | $ 0.38 | $ 0.46 | $ 0.68 | $ 0.91
Potentially dilutive shares excluded from diluted per share amounts: |  |  |  |
Stock options (in shares) | 146 |  | 163 |
Potentially anti-dilutive shares excluded from diluted per share amounts: |  |  |  |
Stock options (in shares) | 306 | 217 | 428 | 417

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