Year Ended December 31,

2012

2011

2010

Numerator:

Net income

$

15,756

$

13,301

$

29,563

Denominator:

Weighted average outstanding shares used to compute basic net income per share

34,871

34,050

35,830

Effect of dilutive securities

1,376

1,110

1,996

Weighted average outstanding shares used to compute diluted net income per share

36,247

35,160

37,826

Net income per share - basic

$

0.45

$

0.39

$

0.83

Net income per share - diluted

$

0.43

$

0.38

$

0.78