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Income Taxes Income Taxes (Details Textual) (USD $)
|
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 28, 2014
|
Jun. 29, 2013
|
Jun. 28, 2014
|
Jun. 29, 2013
|
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| Income Tax Disclosure [Abstract] | ||||
| Income tax expense (benefit) | $ 6,500,000 | $ 28,203,000 | $ 11,856,000 | $ 643,000 |
| Estimated increase in annual effective tax rate due to expiration of research tax credit | 3.00% | |||
| Tax benefit from release of uncertain tax position | 33,700,000 | |||
| Federal research tax credit research | $ 5,900,000 | |||