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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2012
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,
 
2011
 
2012
 
2011
 
2012
Balance, beginning of period
$
2,156

 
$
4,779

 
$
982

 
$
6,871

Charges to operations
2,190

 
1,274

 
4,457

 
1,691

Deductions for costs incurred
(669
)
 
(969
)
 
(1,762
)
 
(3,478
)
Balance, end of period
$
3,677

 
$
5,084

 
$
3,677

 
$
5,084