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Warranties (Tables)
 12 Months Ended
Dec. 31, 2014
Product Warranties Disclosures [Abstract]  
Product warranty liabilities
 
2014
 
2013
Balance at January 1,
$
33,386

 
$
28,001

Warranty claims
(52,297
)
 
(50,859
)
Warranty accruals
53,137

 
56,244

Balance at December 31,
$
34,226

 
$
33,386