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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
Basic net income per share:        
Net income $ 5,200 $ 7,260 $ 10,795 $ 11,008
Weighted average common shares 15,362 15,962 15,362 15,962
Basic net income per share (in dollars per share) $ 0.34 $ 0.45 $ 0.70 $ 0.69
Diluted net income per share:        
Net income $ 5,200 $ 7,260 $ 10,795 $ 11,008
Weighted average common shares 15,362 15,962 15,362 15,962
Effect of dilutive securities: stock options 95 44 65 50
Diluted weighted average common shares 15,457 16,006 15,427 16,012
Diluted net income per share (in dollars per share) $ 0.34 $ 0.45 $ 0.70 $ 0.69