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Employee Benefit Plans (Defined Contribution Plans) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 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 $ 225 $ 135 $ 460 $ 367
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 $ 26 $ 27 $ 45 $ 45