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Allowance for Doubtful Accounts (Tables)
 9 Months Ended
Sep. 28, 2013
Allowance for Doubtful Accounts [Abstract]  
Allowance for doubtful accounts
Allowance for doubtful accounts on accounts receivable consists of the following (in thousands):
 
September 28,
2013
 
December 29,
2012
Allowance for doubtful accounts, current
$
3,408

 
$
3,737

Allowance for doubtful accounts, non-current
5,150

 
5,434

 
$
8,558

 
$
9,171