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Product Warranties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Summary of changes in product warranties reserve:
Warranty reserve, beginning of period	$ 64,008	$ 69,787
Provision	6,415	3,732
Payments	(10,137)	(8,189)
Warranty reserve, end of period	$ 60,286	$ 65,330

- 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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