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Product Warranty Reserves (Tables)
 9 Months Ended
Sep. 28, 2019
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
The following is a summary of the Company's product warranty activity:
 
Three Months Ended
 
 
Nine Months Ended
 
September 28,
2019
 
September 29,
2018
 
 
September 28,
2019
 
September 29,
2018
Product warranty reserve at beginning of period
$
1,082

 
$
1,243

 
 
$
1,069

 
$
1,356

Warranty liabilities accrued
260

 
594

 
 
1,403

 
1,765

Warranty liabilities settled
(323
)
 
(579
)
 
 
(1,414
)
 
(1,815
)
Changes for pre-existing warranty liabilities
—

 
(167
)
 
 
(39
)
 
(215
)
Product warranty reserve at end of period
$
1,019

 
$
1,091

 
 
$
1,019

 
$
1,091