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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 27, 2020
Commitments and Contingencies Disclosure [Abstract]  
Activity Related to the Warranty Accrual
Activity related to the warranty accrual was as follows (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 27, 2020
 
June 29, 2019
 
June 27, 2020
 
June 29, 2019
Balance at beginning of period
$
13,998

 
$
11,628

 
$
13,856

 
$
11,964

Provision
3,396

 
2,682

 
7,870

 
5,333

Warranty usage
(3,625
)
 
(2,340
)
 
(7,957
)
 
(5,327
)
Balance at end of period
$
13,769

 
$
11,970

 
$
13,769

 
$
11,970