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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2013
Commitments and Contingencies [Abstract]  
Changes in product warranties
The following table provides the changes in our product warranties (in thousands):

 
 
Three Months Ended
  
Nine Months Ended
 
 
 
September 30,
  
September 30,
 
 
 
2013
  
2012
  
2013
  
2012
 
Balance, beginning of period
 
$
23,498
  
$
18,849
  
$
17,288
  
$
13,500
 
Liabilities accrued for current year sales
  
20,755
   
23,226
   
61,131
   
58,882
 
Settlements of warranty claims
  
(23,556
)
  
(23,021
)
  
(57,722
)
  
(53,328
)
Balance, end of period
 
$
20,697
  
$
19,054
  
$
20,697
  
$
19,054