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Product Warranties (Tables)
 6 Months Ended
Jun. 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
 
Six Months Ended
 
June 30,
 
June 30,
 
2013
 
2014
 
2013
 
2014
Balance, beginning of period
$
2,743

 
$
3,244

 
$
4,455

 
$
2,965

Charges to operations
372

 
412

 
490

 
826

Deductions for payments made
(145
)
 
(175
)
 
(1,166
)
 
(350
)
Changes in estimates
(287
)
 
(118
)
 
(1,096
)
 
(78
)
Balance, end of period
$
2,683

 
$
3,363

 
$
2,683

 
$
3,363