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Warranties (Tables)
 12 Months Ended
Dec. 31, 2015
Product Warranties Disclosures [Abstract]  
Product warranty liabilities
 
2015
 
2014
Warranty liabilities, balance at January 1,
$
34,226

 
$
33,386

Warranty claims
(61,819
)
 
(52,297
)
Warranty accruals
62,816

 
53,137

Warranty liabilities, balance at December 31,
$
35,223

 
$
34,226