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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 28, 2013
Other Liabilities, Current [Abstract]  
Other current liabilities
Other current liabilities are as follows (in thousands):

 
2013
 
2012
Accrued interest expense                                                                        
$
20,040

 
$
20,671

Accrued customer rebates                                                                        
16,901

 
16,187

Restructuring liabilities                                                                        
4,555

 
7,474

Other accrued liabilities                                                                        
39,702

 
33,035

 
$
81,198

 
$
77,367