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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Basic net income per share:        
Net income $ 1,326 $ 7,924 $ 3,235 $ 12,561
Weighted average common shares 14,730 14,734 14,730 14,806
Basic net income (in dollars per share) $ 0.09 $ 0.54 $ 0.22 $ 0.85
Diluted net income per share:        
Net income $ 1,326 $ 7,924 $ 3,235 $ 12,561
Weighted average common shares 14,730 14,734 14,730 14,806
Effect of dilutive securities: stock options (in shares) 0 60 0 75
Diluted weighted average common shares 14,730 14,794 14,730 14,881
Diluted net income (in dollars per share) $ 0.09 $ 0.54 $ 0.22 $ 0.84