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Employee Benefit Plans (Defined Contribution Plans) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 24, 2016
Sep. 26, 2015
Sep. 24, 2016
Sep. 26, 2015
Non-Collective-Bargaining Plan [Member]        
Defined Contribution Plans [Line Items]        
Percentage of Employees Covered     86.00%  
Employer Matching Contribution, Percentage     1.00%  
Employer Matching Contribution, Discretionary Percentage     2.00%  
Maximum Annual Contribution Per Employee, Percentage     3.00%  
Cost (Credit) Recognized $ (132) $ 223 $ 333 $ 683
Collective-Bargaining Plan [Member]        
Defined Contribution Plans [Line Items]        
Percentage of Employees Covered     14.00%  
Maximum Annual Contribution Per Employee, Percentage     2.75%  
Cost (Credit) Recognized $ 18 $ 17 $ 53 $ 62