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Accounts Receivable (Tables)
 9 Months Ended
Sep. 27, 2015
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
(Dollars in thousands)
 
 
 
 
September 27, 2015
 
December 28, 2014
Trade receivables
$
110,747

 
$
96,177

Other receivables
8,865

 
6,830

 
119,612

 
103,007

Allowance for doubtful accounts
(658
)
 
(514
)
Accounts receivable, net
$
118,954

 
$
102,493