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Warranty Reserves (Tables)
 6 Months Ended
Jun. 30, 2013
Changes in Accrued Warranty Expense

The following table shows the changes in accrued warranty expense for the three and six months ended June 30, 2012 and 2013:

 

 

For the three months ended
June 30,

 

  

For the six months ended
June 30,

 

 

2012

 

 

2013

 

  

2012

 

 

2013

 

 

(Unaudited)

 

 

(Unaudited)

 

  

(Unaudited)

 

 

(Unaudited)

 

Beginning balance             

$

  142,396

  

 

$

  107,589

  

  

$

  135,708

  

 

$

  115,566

  

Additions             

 

  22,195

  

 

 

  12,149

  

  

 

  49,958

  

 

 

  31,721

  

Usage             

 

(24,284

) 

 

 

(13,035

) 

  

 

(45,359

) 

 

 

(40,584

) 

Ending balance             

$

  140,307

  

 

$

  106,703

  

  

$

  140,307

  

 

$

  106,703