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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 26, 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 EndedNine Months Ended
 September 26, 2020September 28, 2019September 26, 2020September 28, 2019
Balance at beginning of period$13,769 $11,970 $13,856 $11,964 
Provision5,525 3,484 13,395 8,817 
Warranty usage(4,633)(3,082)(12,590)(8,409)
Balance at end of period$14,661 $12,372 $14,661 $12,372