Summary of Significant Accounting Policies (Details) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Weighted average shares used to calculate basic and diluted net income per share
Weighted average shares outstanding	125,465	122,930	124,532	122,929
Effect of dilutive potential common shares from:
Convertible senior notes	1,028	906	1,052	941
Equity awards	4,596	3,719	4,290	3,812
Warrants sold in connection with convertible senior notes	9,512	4,952	8,756	5,444
Weighted average shares used in calculation of diluted net income per share	140,601	132,507	138,630	133,126
Potentially dilutive shares excluded from calculation due to anti-dilutive effect	317	2,727	1,305	2,871

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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