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Product Warranty Reserves
 9 Months Ended
Sep. 30, 2017
Product Warranties Disclosures [Abstract]  
Product Warranty Reserves
PRODUCT WARRANTY RESERVES

The Company generally provides product warranties related to manufacturing defects and specific performance standards for its products. Product warranty reserves are included in accrued expenses in the Company's Consolidated Condensed Financial Statements. The following is a summary of the Company's product warranty activity:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
2017
 
September 24,
2016
 
September 30,
2017
 
September 24,
2016
Product warranty reserve at beginning of period
$
2,145

 
$
2,214

 
$
2,307

 
$
2,159

Warranty liabilities accrued
1,453

 
1,537

 
4,365

 
4,574

Warranty liabilities settled
(1,394
)
 
(1,583
)
 
(4,365
)
 
(5,128
)
Changes for pre-existing warranty liabilities
(48
)
 
(45
)
 
(151
)
 
518

Product warranty reserve at end of period
$
2,156

 
$
2,123

 
$
2,156

 
$
2,123