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Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Product Warranty Liabilities
Reserve at January 1	$ 24,924	$ 23,814	$ 18,244
Additions	34,288	24,791	23,134
Payments	(31,812)	(23,681)	(17,564)
Reserve at December 31	$ 27,400	$ 24,924	$ 23,814

- 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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