Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,865,589	2,065,842
Earnings Per Share, Basic [Abstract]
Net income	$ 3,385	$ 2,351
Weighted Average Number of Shares Outstanding, Basic	33,900,000	33,365,000
Net income per share-basic	$ 0.10	$ 0.07
Earnings Per Share, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	33,900,000	33,365,000
Dilutive Effect of Employee Stock Plans	$ 920	$ 976
Weighted Average Number of Shares Outstanding, Diluted	34,820,000	34,341,000
Net income per share - diluted	$ 0.10	$ 0.07