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

Warranty claims
(37,600
)
Warranty accruals
42,718

Warranty liabilities, balance at June 30, 2017
$
41,741