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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2014
Commitments and Contingencies [Abstract]  
Changes in Product Warranties
The following table provides the changes in our product warranties (in thousands):

 
 
Three Months Ended
 
 
 
March 31,
 
 
 
2014
  
2013
 
 
 
  
 
Balance, beginning of period
 
$
18,041
  
$
17,288
 
Liabilities accrued for current year sales
  
19,191
   
18,356
 
Settlements of warranty claims
  
(16,858
)
  
(16,230
)
Balance, end of period
 
$
20,374
  
$
19,414