Balance Sheet Information Schedule of Plant Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Dec. 28, 2014
Property, Plant and Equipment [Line Items]      
Plant Assets, Gross $ 967,897   $ 955,545
Accumulated depreciation (366,148)   (349,639)
Total 601,749   605,906
Depreciation 17,505 16,205  
Land      
Property, Plant and Equipment [Line Items]      
Plant Assets, Gross 14,211   14,211
Buildings      
Property, Plant and Equipment [Line Items]      
Plant Assets, Gross 210,700   208,341
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Plant Assets, Gross 651,158   641,818
Projects in progress      
Property, Plant and Equipment [Line Items]      
Plant Assets, Gross 91,828   91,175
Assets under capital lease      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation (10,756)   (9,935)
Total $ 18,520   $ 18,127