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Employee Benefit Plans (Defined Contribution Plans) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
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%  
Defined Contribution Plan, Increase (Decrease), Cost $ (33) $ 245 $ 231 $ 478
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 $ 38 $ 42 $ 67 $ 60