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Net Income per Share (Tables)
 6 Months Ended
Jun. 30, 2012
Earnings Per Share Reconciliation [Abstract]  
Schedule of Components Used in Diluted and Basic Income Per Common Share
The following table sets forth the components used in the computation of basic and diluted net income per common share (in thousands, except per share data):
 
 
For the Three Months
Ended June 30,
 
For the Six Months
Ended June 30,
 
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
Net income
$
44,239

 
$
47,921

 
$
87,466

 
$
98,538

Denominator:

 

 
 
 
 
Shares used for basic net income per common share
178,547

 
186,612

 
178,333

 
186,731

Effect of dilutive securities:

 

 
 
 
 
Stock options
2,092

 
2,810

 
2,259

 
3,081

RSUs and deferred stock units
1,178

 
757

 
1,488

 
969

Shares used for diluted net income per common share
181,817

 
190,179

 
182,080

 
190,781

Basic net income per common share
$
0.25

 
$
0.26

 
$
0.49

 
$
0.53

Diluted net income per common share
$
0.24

 
$
0.25

 
$
0.48

 
$
0.52