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Commitments and Contingencies (Details Textual) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Letter Of Credit [Member]
Site Contingency, Accrual, Undiscounted Amount	$ 1,340	$ 1,340
Loss Contingency, Estimate Of Possible Loss	12,292	11,925
Environmental Exit Costs, Anticipated Cost			2,000
Accounts Payable and Accrued Liabilities	733	733
Product Warranty Accrual, Noncurrent	$ 193	$ 494

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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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.

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