Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The calculation of basic and diluted net income per share is as follows (in thousands, except per share amounts):

	Three Months Ended March 31,
	2014		2013
Basic:
Net income	$	6,194	$	3,385
Weighted average shares outstanding — basic	35,225		33,900
Net income per share — basic	$	0.18	$	0.10
Diluted:
Net income	$	6,194	$	3,385
Weighted average shares outstanding — basic	35,225		33,900
Add: Dilutive effect of employee stock plans	1,080		920
Weighted average shares outstanding — diluted	36,305		34,820
Net income per share — diluted	$	0.17	$	0.10