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Warranties (Tables)
 12 Months Ended
Dec. 31, 2017
Product Warranties Disclosures [Abstract]  
Product warranty liabilities
 
2017
 
2016
Warranty liabilities, balance at January 1,
$
36,623

 
$
35,223

Warranty claims
(79,660
)
 
(73,925
)
Warranty accruals
87,435

 
75,325

Warranty liabilities, balance at December 31,
$
44,398

 
$
36,623