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Warranties (Tables)
 12 Months Ended
Dec. 31, 2012
Warranties  
Product warranty liabilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2012

 

2011

Balance at January 1,

$
21,642 

 

$
22,429 

Warranty claims

 
(50,009)

 

 
(46,779)

Warranty accruals

 
56,368 

 

 
45,992 

Balance at December 31,

$
28,001 

 

$
21,642