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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2014
Product Warranties Disclosures [Abstract]  
Warranty Accrual and Cost Activity
Our warranty accrual and cost activity is as follows (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2013
 
2014
 
2013
 
2014
Balance, beginning of period
$
2,683

 
$
3,363

 
$
4,455

 
$
2,965

Charges to operations
320

 
344

 
1,025

 
1,170

Deductions for payments made
(142
)
 
(476
)
 
(1,308
)
 
(826
)
Changes in estimates
(5
)
 
49

 
(1,316
)
 
(29
)
Balance, end of period
$
2,856

 
$
3,280

 
$
2,856

 
$
3,280