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Long-Term Debt and Credit Arrangements (Equipment Notes Payable) (Details) - Long-term Debt, Type [Domain]
$ in Thousands
6 Months Ended
Jun. 27, 2015
USD ($)
yr
Rate
Dec. 27, 2014
USD ($)
Debt Instrument [Line Items]    
Escrow Deposit | $ $ 0 $ 574
Minimum [Member] | Equipment Note Payable [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.00%  
Term of Note Payable | yr 3  
Maximum [Member] | Equipment Note Payable [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.86%  
Term of Note Payable | yr 7