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Contingent Consideration (Tables)
 6 Months Ended
Jun. 27, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Business Acquisitions By Acquisition, Contingent Consideration
The following table summarizes the changes in the carrying value of estimated contingent consideration:
 
June 27, 2020
 
December 28, 2019
Contingent consideration, beginning of the year
$
4,002

 
$
4,698

Additions for acquisitions
—

 
1,316

Reduction of liability for payments made
(1,190
)
 
(1,938
)
Decrease of liability related to re-measurement of fair value
—

 
(74
)
Total contingent consideration, end of the period
2,812

 
4,002

Current portion of contingent consideration
(1,079
)
 
(1,954
)
Contingent consideration, less current portion
$
1,733

 
$
2,048