Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Income Per Share

The following table sets forth the computation of basic and diluted net income per share:

	Three Months Ended March 31,
	2013		2012
Numerator:
Net income	$	5,761	$	22,768
Denominator:
Shares used in net income per common share – basic		52,773,000		52,504,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan		586,000		718,000
Shares used in net income per common share – diluted		53,359,000		53,222,000
Net income per common share:
Basic	$	0.11	$	0.43
Diluted	$	0.11	$	0.43