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Warranties (Tables)
 12 Months Ended
Dec. 31, 2013
Product Warranties Disclosures [Abstract]  
Product warranty liabilities
 
2013
 
2012
Balance at January 1,
$
28,001

 
$
21,642

Warranty claims
(50,859
)
 
(50,009
)
Warranty accruals
56,244

 
56,368

Balance at December 31,
$
33,386

 
$
28,001