v2.4.0.6
Accounting for Guarantees (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Change in the Liability for Product Warranties  
Balance as of January 1, 2012 $ 4,228,000
Payments made under product warranties (2,207,000)
Accrual for product warranties issued 3,098,000
Balance as of June 30, 2012 $ 5,119,000