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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2015
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,
 
  
2015
  
2014
 
     
Balance, beginning of period                                                                                                    
 
$
19,328
  
$
18,041
 
Liabilities accrued for current year sales                                                                                                
  
21,036
   
19,191
 
Settlements of warranty claims                                                                                                
  
(20,379
)
  
(16,858
)
Balance, end of period                                                                                                    
 
$
19,985
  
$
20,374