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Product Warranties (Details) (USD $) In Thousands	6 Months Ended
Product Warranties (Details) (USD $) In Thousands	Jun. 30, 2011	Jun. 30, 2010
Company's accrual for product warranty claims
Balance at January 1	$ 23,103	$ 22,214
Charges to expense	14,445	10,869
Settlements	(12,746)	(10,478)
Balance at June 30	$ 24,802	$ 22,605

- 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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