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Accrued Warranty Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Product warranty obligation
Balance at beginning of year	$ 3,996	$ 3,138	$ 2,820
Amounts charged to costs and expenses	6,539	4,479	5,252
Costs incurred	(5,165)	(3,621)	(4,934)
Balance at end of year	$ 5,370	$ 3,996	$ 3,138

- 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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