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Net Income per Share (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 1,891 | $ 3,488 | $ 11,455 | $ 16,661
Less distributed and undistributed earnings allocated to participating securities | (139) | (124) | (333) | (481)
Net income allocated to common shares | $ 1,752 | $ 3,364 | $ 11,122 | $ 16,180
Weighted average common shares outstanding (in shares) | 24,770 | 24,820 | 24,797 | 24,858
Incremental shares from assumed conversions of common stock options (in shares) | 4 | 24 | 5 | 27
Adjusted weighted average common shares outstanding (in shares) | 24,774 | 24,844 | 24,802 | 24,885
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect (in shares) | 0 | 16 | 0 | 16

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