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Income Taxes (Unrecognized Tax Benefits - Text) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2015
Dec. 28, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]        
Unrecognized tax benefits $ 19,430 $ 17,563 $ 17,068 $ 13,591
Portion of unrecognized tax benefits, including accrued interest and penalties, that if recognized, would impact the effective tax rate 19,300 18,300    
Income tax penalties and interest benefit (expense) 600 (1,500) 200  
Unrecognized tax benefits, income tax penalties and interest accrued 1,600 2,200    
Unrecognized tax benefits, increase resulting from prior period tax positions 3,022 2,177 $ 73  
Minimum [Member]        
Income Tax Contingency [Line Items]        
Unrecognized tax benefits, increase resulting from prior period tax positions $ 2,000      
Maximum [Member]        
Income Tax Contingency [Line Items]        
Unrecognized tax benefits, increase resulting from prior period tax positions   $ 3,000