Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2013

Net Income 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):

	Years Ended December 31
	2013		2012		2011
Basic:
Net income	$	23,979	$	16,178	$	10,389
Weighted average shares outstanding — basic	34,736		33,307		33,123
Net income per share — basic	$	0.69	$	0.49	$	0.31
Diluted:
Net income	$	23,979	$	16,178	$	10,389
Weighted average shares outstanding — basic	34,736		33,307		33,123
Add: Dilutive effect of employee stock plans	1,041		906		980
Weighted average shares outstanding — diluted	35,777		34,213		34,103
Net income per share — diluted	$	0.67	$	0.47	$	0.30