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Warranties (Tables)
9 Months Ended
Sep. 30, 2017
Product Warranties Disclosures [Abstract]  
Product warranty liabilities
Warranty liabilities, balance at December 31, 2016
$
36,623

Warranty claims
(60,173
)
Warranty accruals
65,450

Warranty liabilities, balance at September 30, 2017
$
41,900