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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2014
Commitments and Contingencies [Abstract]  
Changes in Product Warranties
The following table provides the changes in our product warranties (in thousands):

 
 
Three Months Ended
  
Six Months Ended
 
 
 
June 30,
  
June 30,
 
 
 
2014
  
2013
  
2014
  
2013
 
Balance, beginning of period
 
$
20,374
  
$
19,414
  
$
18,041
  
$
17,288
 
Liabilities accrued for current year sales
  
22,425
   
22,020
   
41,616
   
40,376
 
Settlements of warranty claims
  
(19,998
)
  
(17,936
)
  
(36,856
)
  
(34,166
)
Balance, end of period
 
$
22,801
  
$
23,498
  
$
22,801
  
$
23,498