Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 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:

	Year Ended
	December 31, 2015		December 31, 2014		December 31, 2013
	(In thousands, except per share data)
Net income	$	30,760	$	30,518	$	23,979
Weighted-average shares outstanding — basic	35,857		35,650		34,736
Add: Dilutive effect of employee stock plans	861		972		1,041
Weighted-average shares outstanding — diluted	36,718		36,622		35,777
Net income per share — basic	$	0.86	$	0.86	$	0.69
Net income per share — diluted	$	0.84	$	0.83	$	0.67
Anti-dilutive weighted-average shares related to stock award plans	555		640		850