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Warranties (Tables)
3 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Product warranty liabilities
Warranty liabilities, balance at December 31, 2017
$
44,398

Warranty claims
(19,554
)
Warranty accruals
20,797

Warranty liabilities, balance at March 31, 2018
$
45,641