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Warranties (Tables)
 9 Months Ended
Sep. 30, 2017
Product Warranties Disclosures [Abstract]  
Components of the warranty accrual

Components of the warranty accrual, which were included in the accompanying condensed consolidated balance sheets with other current liabilities, were as follows (in thousands):

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

September 30, 2017

 

 

September 24, 2016

 

 

September 30, 2017

 

 

September 24, 2016

 

Balance as of beginning of period

 

$

4,602

 

 

$

4,556

 

 

$

3,838

 

 

$

4,504

 

Accruals for warranties issued during period

 

 

1,020

 

 

 

1,100

 

 

 

3,800

 

 

 

3,529

 

Settlements during the period

 

 

(1,080

)

 

 

(1,471

)

 

 

(3,096

)

 

 

(3,848

)

Balance as of end of period

 

$

4,542

 

 

$

4,185

 

 

$

4,542

 

 

$

4,185