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

Warranty claims
(21,537
)
Warranty accruals
22,943

Warranty liabilities, balance at March 31, 2019
$
53,626