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Product Warranty Reserves (Tables)
 3 Months Ended
Mar. 31, 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
 
March 31,
2018
 
April 1,
2017
 
 
 
(As adjusted)
Product warranty reserve at beginning of period
$
1,356

 
$
1,439

Warranty liabilities accrued
614

 
404

Warranty liabilities settled
(691
)
 
(416
)
Changes for pre-existing warranty liabilities
(31
)
 
(70
)
Product warranty reserve at end of period
$
1,248

 
$
1,357