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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2012
Accounting Policies [Abstract]  
Weighted-average shares used to calculate basic and diluted net income per share
The following table presents the calculation of weighted average shares used to calculate basic and diluted net income per share (in thousands):
 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
2012
 
October 2,
2011
 
September 30,
2012
 
October 2,
2011
Weighted average shares outstanding
122,930

 
122,079

 
122,929

 
124,017

Effect of dilutive potential common shares from:
 
 
 
 
 
 
 
Convertible senior notes
906

 
1,292

 
941

 
4,885

Equity awards
3,719

 
4,549

 
3,812

 
5,315

Warrants sold in connection with convertible senior notes
4,952

 
8,046

 
5,444

 
9,403

Weighted average shares used in calculation of diluted net income per share
132,507

 
135,966

 
133,126

 
143,620

Potentially dilutive shares excluded from calculation due to anti-dilutive effect
2,727

 
1,543

 
2,871

 
1,189