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Product Warranties (Tables)
 3 Months Ended
Mar. 31, 2013
Product Warranties Disclosures [Abstract]  
Warranty Accrual and Cost Activity
 
Three Months Ended
 
March 31,
 
2012
 
2013
Balance, beginning of period
$
6,871

 
$
4,455

Charges to operations
368

 
118

Deductions for payments made
(309
)
 
(1,021
)
Changes in estimates
—

 
(809
)
Balance, end of period
$
6,930

 
$
2,743