Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	347,265	1,865,589
Earnings Per Share, Basic [Abstract]
Net income	$ 6,194	$ 3,385
Weighted Average Number of Shares Outstanding, Basic	35,225,000	33,900,000
Net income per share-basic	$ 0.18	$ 0.10
Earnings Per Share, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	35,225,000	33,900,000
Dilutive Effect of Employee Stock Plans	$ 1,080	$ 920
Weighted Average Number of Shares Outstanding, Diluted	36,305,000	34,820,000
Net income per share - diluted	$ 0.17	$ 0.10