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Accounts Receivable (Tables)
 9 Months Ended
Sep. 29, 2013
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
(Dollars in thousands)
 
 
 
 
September 29, 2013
 
December 30, 2012
Trade receivables
$
114,584

 
$
91,747

Other receivables
6,397

 
7,293

 
120,981

 
99,040

Allowance for doubtful accounts
(972
)
 
(573
)
Accounts receivable, net
$
120,009

 
$
98,467