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

Warranty claims
(17,493
)
Warranty accruals
16,967

Warranty liabilities, balance at March 31, 2017
$
36,097