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Product Warranty Reserves (Tables)
 6 Months Ended
Jun. 30, 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
 
Six Months Ended
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
 
 
 
(As Adjusted)
 
 
 
(As Adjusted)
Product warranty reserve at beginning of period
$
1,248

 
$
1,357

 
$
1,356

 
$
1,439

Warranty liabilities accrued
623

 
491

 
1,236

 
895

Warranty liabilities settled
(626
)
 
(490
)
 
(1,318
)
 
(906
)
Changes for pre-existing warranty liabilities
(2
)
 
59

 
(31
)
 
(11
)
Product warranty reserve at end of period
$
1,243

 
$
1,417

 
$
1,243

 
$
1,417