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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 30, 2017
Supplemental Cash Flow Elements [Abstract]  
Summary of supplemental cash flow information
The following table summarizes supplemental cash flow information (in thousands):
Fiscal Year
2017
 
2016
 
2015
Cash paid during the year for:
 

 
 

 
 

Interest
$
43,245

 
$
26,867

 
$
20,042

Income taxes, net of refunds
$
36,571

 
$
14,163

 
$
131,838

Supplemental disclosures of non-cash investing and financing activities:
 

 
 

 
 

Additions to property, plant and equipment included in accounts payable
$
2,300

 
$
4,762

 
$
7,966

Additions to property, plant and equipment acquired under capital leases
$
—

 
$
432

 
$
1,462