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Employee Benefit Plans (Defined Contribution Plans) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 25, 2016
Jun. 27, 2015
Jun. 25, 2016
Jun. 27, 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 Recognized $ 239 $ 225 $ 465 $ 460
Collective-Bargaining Plan [Member]        
Defined Contribution Plans [Line Items]        
Percentage of Employees Covered     14.00%  
Maximum Annual Contribution Per Employee, Percentage     2.75%  
Cost Recognized $ 20 $ 26 $ 35 $ 45