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Net Income Per Share (Details) (USD $)
In Thousands, except Share data, 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]        
Antidilutive securities excluded from computation of earnings per share 353,422 1,346,561 366,021 1,581,335
Basic:        
Net income $ 7,789 $ 6,016 $ 13,983 $ 9,401
Weighted Average Number of Shares Outstanding, Basic 35,661,000 34,450,000 35,451,000 34,177,000
Net income per share-basic $ 0.22 $ 0.17 $ 0.39 $ 0.28
Diluted:        
Weighted Average Number of Shares Outstanding, Basic 35,661,000 34,450,000 35,451,000 34,177,000
Dilutive Effect of Employee Stock Plans $ 957 $ 924 $ 1,027 $ 922
Weighted Average Number of Shares Outstanding, Diluted 36,618,000 35,374,000 36,478,000 35,099,000
Net income per share - diluted $ 0.21 $ 0.17 $ 0.38 $ 0.27