Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2012

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
	2012		2011		2010
Basic:
Net income	$	16,178	$	10,389	$	4,892
Weighted average shares outstanding — basic	33,307		33,123		32,651
Net income per share — basic	$	0.49	$	0.31	$	0.15
Diluted:
Net income	$	16,178	$	10,389	$	4,892
Weighted average shares outstanding — basic	33,307		33,123		32,651
Add: Dilutive effect of employee stock plans	906		980		862
Weighted average shares outstanding — diluted	34,213		34,103		33,513
Net income per share — diluted	$	0.47	$	0.30	$	0.15