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Warranties (Tables)
 12 Months Ended
Dec. 31, 2016
Product Warranties Disclosures [Abstract]  
Product warranty liabilities
 
2016
 
2015
Warranty liabilities, balance at January 1,
$
35,223

 
$
34,226

Warranty claims
(73,925
)
 
(61,819
)
Warranty accruals
75,325

 
62,816

Warranty liabilities, balance at December 31,
$
36,623

 
$
35,223