Three Months Ended June 30,

Six Months Ended June 30,

2011

2010

2011

2010

Numerators:

Numerator for both basic and diluted EPS, net income

$

38,472,169

$

34,057,330

$

80,805,051

$

66,519,460

Denominators:

Denominator for basic EPS, weighted-average shares outstanding

142,279,210

139,124,771

142,071,203

138,697,007

Potentially dilutive shares resulting from stock plans

1,917,784

1,421,509

1,992,412

1,365,635

Denominator for diluted EPS

144,196,994

140,546,280

144,063,615

140,062,642

Shares related to stock plans not included in diluted average common shares outstanding because their effect would be antidilutive

1,078,512

285,998

307,231

301,038