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Product Warranties (Tables)
 6 Months Ended
Jun. 30, 2012
Product Warranties Disclosures [Abstract]  
Warranty Accrual and Cost Activity
Our warranty accrual and cost activity is as follows as of and for the three and six months ended June 30, (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2011
 
2012
 
2011
 
2012
Balance, beginning of period
$
881

 
$
6,930

 
$
982

 
$
6,871

Charges to operations
1,781

 
48

 
2,265

 
416

Deductions for costs incurred
(506
)
 
(2,199
)
 
(1,091
)
 
(2,508
)
Balance, end of period
$
2,156

 
$
4,779

 
$
2,156

 
$
4,779