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Income Taxes Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Income Tax Contingency        
Provision for income taxes $ 121,668 $ 6,017 $ 189,333 $ 58,180
Effective tax rate 31.70% 31.70% 30.70% 31.40%