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Product Warranties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Company's accrual for product warranty claims
Balance at January 1	$ 22,071	$ 23,103
Charges to expense	5,290	6,377
Settlements	(4,474)	(5,984)
Balance at March 31	$ 22,887	$ 23,496

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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