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Employee Benefit Plans (Defined Contribution Plans) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Rate
Sep. 28, 2013
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%  
(Credit) Cost Recognized $ (95) $ 246 $ 272 $ 681
Collective-Bargaining Plan [Member]
       
Defined Contribution Plans [Line Items]        
Percentage of Employees Covered     15.00%  
Maximum Annual Contribution Per Employee, Percentage     2.75%  
(Credit) Cost Recognized $ 20 $ 22 $ 65 $ 63