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Credit Agreement (Tables)
 9 Months Ended
Sep. 26, 2020
Debt Disclosure [Abstract]  
Schedule of Borrowings Under Credit Facility
The following table summarizes our borrowings under the credit facility ($ in thousands):
September 26,
2020		December 28,
2019
Outstanding borrowings$33,500 $231,000 
Outstanding letters of credit
$3,997 $3,497 
Additional borrowing capacity
$412,503 $215,503 
Weighted-average interest rate
2.5 %3.5 %