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Product Warranty Reserves (Tables)
 3 Months Ended
Mar. 31, 2015
Product Warranty Reserves [Abstract]  
Product warranty reserves
Changes in the Company's product warranty liability for the three-month periods ended March 31, 2015 and 2014 are as follows:

  
Three Months Ended
 March 31,
 
  
2015
  
2014
 
Reserve balance, beginning of the period
 
$
10,032
  
$
12,716
 
Warranty liabilities accrued
  
4,146
   
3,671
 
Warranty liabilities settled
  
(3,384
)
  
(2,917
)
Other
  
(99
)
  
24
 
Reserve balance, end of the period
 
$
10,695
  
$
13,494