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Net Income per Share (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 8,385 | $ 10,082 | $ 19,840 | $ 26,743
Less distributed and undistributed earnings allocated to participating securities | (243) | (289) | (576) | (769)
Net income allocated to common shares | $ 8,142 | $ 9,793 | $ 19,264 | $ 25,974
Weighted average common shares outstanding (in shares) | 24,650 | 24,849 | 24,747 | 24,855
Incremental shares from assumed conversions of common stock options (in shares) | 2 | 18 | 5 | 24
Adjusted weighted average common shares outstanding (in shares) | 24,652 | 24,867 | 24,752 | 24,879
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect (in shares) | 16 | 0 | 5 | 10

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