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Warranties (Tables)
9 Months Ended
Sep. 30, 2019
Product Warranties Disclosures [Abstract]  
Product warranty liabilities
Warranty liabilities, balance at December 31, 2018
$
52,220

Warranty claims
(74,467
)
Warranty accruals
76,731

Warranty liabilities, balance at September 30, 2019
$
54,484