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Net Income Per Share of Common Stock (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net income $ 3,479 $ 4,123 $ 8,336 $ 8,774
Denominator:        
Weighted-average common stock outstanding 22,873 23,107 23,188 22,900
Effect of stock options 576 1,058 654 1,128
Diluted weighted average common stock outstanding 23,449 24,165 23,842 24,028
Basic net income per share $ 0.15 $ 0.18 $ 0.36 $ 0.38
Diluted net income per share $ 0.15 $ 0.17 $ 0.35 $ 0.37