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Commitments and Contingencies (Details) (USD $)	3 Months Ended
Commitments and Contingencies (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty liability balance, beginning of the period	$ 3,954,000	$ 3,438,000
Product warranty accruals	1,147,000	808,000
Utilization of accrual	(1,212,000)	(1,182,000)
Warranty liability balance, end of the period	3,889,000	3,064,000
Product Warranty Accrual, Current	3,100,000
Product Warranty Accrual, Noncurrent	$ 800,000

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. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

+ References+ Details