Commitments and Contingencies (Tables)

3 Months Ended

Mar. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Warranty Liabilities

The activity in the accrued warranty liabilities account was as follows (in thousands):

	Three Months Ended
	March 30, 2019			March 31, 2018
Balance at beginning of year	$	10,389		$	9,320
Additions charged to costs and expenses for current-year sales		3,192			3,500
Deductions from reserves		(3,127	)		(3,271	)
Changes in liability for pre-existing warranties during the current year,    including expirations		1,166			(77	)
Balance at end of period	$	11,620		$	9,472