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Warranties (Tables)
9 Months Ended
Sep. 30, 2016
Product Warranties Disclosures [Abstract]  
Product warranty liabilities
Warranty liabilities, balance at December 31, 2015
$
35,223

Warranty claims
(56,067
)
Warranty accruals
56,076

Warranty liabilities, balance at September 30, 2016
$
35,232