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Accrued Warranty Costs (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
Product warranty obligation
Balance at beginning of period	$ 5,616	$ 4,284	$ 5,370	$ 3,996
Amounts charged to costs and expenses	1,776	1,607	3,344	3,234
Costs incurred	(1,314)	(1,293)	(2,636)	(2,632)
Balance at end of period	$ 6,078	$ 4,598	$ 6,078	$ 4,598

- 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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