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Employee Benefit Plans (Defined Contribution Plans) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Non-Collective-Bargaining Plan [Member]        
Defined Contribution Plans [Line Items]        
Percentage of Employees Covered     85.00%  
Employer Matching Contribution, Percentage     1.00%  
Employer Matching Contribution, Discretionary Percentage     2.00%  
Maximum Annual Contribution Per Employee, Percentage     3.00%  
Cost Recognized $ 223 $ (95) $ 683 $ 272
Collective-Bargaining Plan [Member]        
Defined Contribution Plans [Line Items]        
Percentage of Employees Covered     15.00%  
Maximum Annual Contribution Per Employee, Percentage     2.75%  
Cost Recognized $ 17 $ 20 $ 62 $ 65