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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 27, 2014
Other Liabilities, Current [Abstract]  
Other current liabilities
Other current liabilities are as follows (in thousands):

 
 
2014
 
2013
Accrued interest expense                                                                        
 
$
24,379

 
$
20,040

Accrued customer rebates                                                                        
 
21,212

 
16,901

Restructuring liabilities                                                                        
 
5,174

 
4,555

Other accrued liabilities                                                                        
 
36,456

 
39,702

 
 
$
87,221

 
$
81,198