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Product Warranties (Tables)
 3 Months Ended
Mar. 31, 2015
Product Warranties Disclosures [Abstract]  
Warranty Accrual and Cost Activity
Our warranty accrual and cost activity is as follows (in thousands):
 
Three Months Ended
 
March 31,
 
2014
 
2015
Balance, beginning of period
$
2,965

 
$
3,363

Charges to operations
414

 
342

Deductions for payments made
(175
)
 
(385
)
Changes in estimates
40

 
149

Balance, end of period
$
3,244

 
$
3,469