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Product Warranty Reserves (Tables)
 9 Months Ended
Sep. 29, 2018
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 29,
2018
 
September 30,
2017
 
September 29,
2018
 
September 30,
2017
 
 
 
(As Adjusted)
 
 
 
(As Adjusted)
Product warranty reserve at beginning of period
$
1,243

 
$
1,258

 
$
1,356

 
$
1,165

Warranty liabilities accrued
594

 
621

 
1,765

 
1,857

Warranty liabilities settled
(579
)
 
(615
)
 
(1,815
)
 
(2,140
)
Changes for pre-existing warranty liabilities
(167
)
 
(79
)
 
(215
)
 
303

Product warranty reserve at end of period
$
1,091

 
$
1,185

 
$
1,091

 
$
1,185