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Credit Agreement Credit Agreement (Tables)
 9 Months Ended
Sep. 29, 2018
Short-term Debt [Line Items]  
Schedule of Short-term Debt [Table Text Block]
The following tables summarizes our borrowings under the credit facility ($ in thousands):
 
September 29,
2018
 
December 30,
2017
Outstanding borrowings
$
135,800

 
$
24,500

Outstanding letters of credit
$
3,450

 
$
3,150

Additional borrowing capacity
$
160,750

 
$
125,500

Weighted-average interest rate
4.0
%
 
3.1
%