Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Basic and Diluted Net Income Per Share

The calculation of basic and diluted net income per share is as follows:

	Three months ended June 30,				Six months ended June 30,
	2015		2014		2015		2014
	(In thousands, except per share data)
Net income	$	8,751	$	7,789	$	15,069	$	13,983
Weighted-average shares outstanding — basic	36,120		35,661		36,072		35,451
Dilutive effect of employee stock plans	910		957		915		1,027
Weighted-average shares outstanding — diluted	37,030		36,618		36,987		36,478
Net income per share — basic	$	0.24	$	0.22	$	0.42	$	0.39
Net income per share — diluted	$	0.24	$	0.21	$	0.41	$	0.38
Anti-dilutive weighted-average shares related to stock award plans	377		353		356		1,347