Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2013

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 June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Basic:
Net income	$	6,016	$	1,375	$	9,401	$	3,726
Weighted average shares outstanding — basic	34,450		33,390		34,177		33,377
Net income per share — basic	$	0.17	$	0.04	$	0.28	$	0.11
Diluted:
Net income	$	6,016	$	1,375	$	9,401	$	3,726
Weighted average shares outstanding — basic	34,450		33,390		34,177		33,377
Add: Dilutive effect of employee stock plans	924		926		922		952
Weighted average shares outstanding — diluted	35,374		34,316		35,099		34,329
Net income per share — diluted	$	0.17	$	0.04	$	0.27	$	0.11