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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2016
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,
 
  
2016
  
2015
 
       
Balance, beginning of period
 
$
23,395
  
$
19,328
 
Liabilities accrued for current year sales
  
22,581
   
21,036
 
Settlements of warranty claims
  
(19,572
)
  
(20,379
)
Balance, end of period
 
$
26,404
  
$
19,985