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Product Warranties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of changes in product warranties reserve:
Warranty reserve, beginning of period	$ 60,286	$ 65,330	$ 64,008	$ 69,787
Provision	9,302	8,041	15,717	11,773
Payments	(10,798)	(10,567)	(20,935)	(18,756)
Warranty reserve, end of period	$ 58,790	$ 62,804	$ 58,790	$ 62,804

- 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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