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Product Warranties (Tables)
 12 Months Ended
Dec. 31, 2012
Product Warranties Disclosures [Abstract]  
Warranty Accrual and Cost Activity
Our warranty accrual and cost activity is as follows (in thousands):
 
December 31,
 
2010
 
2011
 
2012
Balance, beginning of year
$
993

 
$
982

 
$
6,871

Charges to operations
2,623

 
8,244

 
2,116

Deductions for costs incurred
(2,634
)
 
(2,355
)
 
(4,532
)
Balance, end of year
$
982

 
$
6,871

 
$
4,455