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Product Warranty (Tables)
 3 Months Ended
Mar. 31, 2019
Other Accrued Liabilities The warranty balance below is included in other accrued liabilities on the balance sheet.
 
 
 
For the Three Months

Ended
 
 
 
March 31,
 
 
April 1,
 
 
 
2019
 
 
2018
 
 
 
(in thousands)
 
Balance at beginning of period
 
$
7,909
 
 
$
8,200
 
Acquisition
 
 
14
 
 
 
—
 
Accruals for warranties issued during the period
 
 
3,066
 
 
 
3,063
 
Accruals related to pre-existing warranties
 
 
1,330
 
 
 
(139
)
Settlements made during the period
 
 
(4,567
)
 
 
(3,576
)
Balance at end of period
 
$
7,752
 
 
$
7,548
 
Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances The balance below is included in short and long-term deferred revenue and customer advances on the balance sheet.
 
 
 
For the Three Months

Ended
 
 
 
March 31,
 
 
April 1,
 
 
 
2019
 
 
2018
 
 
 
(in thousands)
 
Balance at beginning of period
 
$
27,422
 
 
$
24,438
 
Deferral of new extended warranty revenue
 
 
5,820
 
 
 
5,139
 
Recognition of extended warranty deferred revenue
 
 
(6,000
)
 
 
(4,987
)
Balance at end of period
 
$
27,242
 
 
$
24,590