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Product Warranty (Tables)
 6 Months Ended
Jun. 28, 2020
Other Accrued Liabilities Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities.
 
    
For the Three Months

Ended
     
For the Six Months

Ended
  
    
June 28,
2020
     
June 30,
2019
     
June 28,
2020
     
June 30,
2019
  
    
(in thousands)
  
Balance at beginning of period
    $ 10,971      $ 7,752      $ 8,996      $ 7,909  
Accruals for warranties issued during the period
      6,200        2,295        11,267        5,360  
Accruals related to
pre-existing
warranties
      356        694        1,412        2,024  
Settlements made during the period
      (4,511 )       (2,608 )       (8,659 )       (7,174 ) 
Acquisition
      —          —          —          14  
  
 
 
     
 
 
     
 
 
     
 
 
  
Balance at end of period
    $ 13,016      $ 8,133      $ 13,016      $ 8,133  
  
 
 
     
 
 
     
 
 
     
 
 
  
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.
 
  
For the Three Months

Ended
 
  
For the Six Months

Ended
 
 
  
June 28,
2020
 
  
June 30,
2019
 
  
June 28,
2020
 
  
June 30,
2019
 
 
  
(in thousands)
 
Balance at beginning of period
  
$
33,503
 
  
$
27,242
 
  
$
30,677
 
  
$
27,422
 
Deferral of new extended warranty revenue
  
 
11,450
 
  
 
5,476
 
  
 
19,050
 
  
 
11,296
 
Recognition of extended warranty deferred revenue
  
 
(4,775
) 
  
 
(4,002
) 
  
 
(9,549
) 
  
 
(10,002
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Balance at end of period
  
$
40,178
 
  
$
28,716
 
  
$
40,178
 
  
$
28,716